270 WSM & RL-26?

[clark33]

I am looking to switch to RL26 in my 270 WSM, will be using the 140gr Accubonds. Just curious where most people start and where they are finding their max just to give me a ball park figure. Thanks

 

[jmad_81]

I run RL-26 in my father in laws 270 WSM with the 140 AB. His has a 26" tube (factory Rem 700 Boone and Crockett Edition) and I am under the Alliant listed max and am getting 3260 fps. I can't remember right off the top of my head what the charge is, I want to say 68gr, but I'm not sure. Please look at the link below and work up.

http://www.alliantpowder.com/reloaders/ ... rtridge=64

It shoots very well, and makes my 270 Weatherby have insecurity issues.

 

[DrMike]

Cartridge          : .270 WSM
Bullet             : .277, 140, Nosler AccuBond 54765
Useable Case Capaci: 71.442 grain H2O = 4.639 cm³
Cartridge O.A.L. L6: 2.860 inch = 72.64 mm
Barrel Length      : 24.0 inch = 609.6 mm
Powder             : Alliant Reloder-26

Predicted data by increasing and decreasing the given charge,
incremented in steps of 1.0% of nominal charge.
CAUTION: Figures exceed maximum and minimum recommended loads !

Step    Fill. Charge   Vel.  Energy   Pmax   Pmuz  Prop.Burnt B_Time
 %       %    Grains   fps   ft.lbs    psi    psi      %        ms

-10.0   88    62.10   2913    2638   43634  12841     99.7    1.366
-09.0   89    62.79   2947    2700   45259  12928     99.8    1.343
-08.0   90    63.48   2981    2762   46951  13006     99.9    1.320
-07.0   91    64.17   3014    2824   48714  13074    100.0    1.298
-06.0   92    64.86   3047    2887   50543  13133    100.0    1.277
-05.0   93    65.55   3081    2950   52434  13190    100.0    1.255
-04.0   94    66.24   3114    3014   54389  13245    100.0    1.234  ! Near Maximum !
-03.0   95    66.93   3146    3077   56416  13299    100.0    1.214  ! Near Maximum !
-02.0   96    67.62   3179    3141   58519  13352    100.0    1.194  ! Near Maximum !
-01.0   96    68.31   3211    3206   60701  13404    100.0    1.175  ! Near Maximum !
+00.0   97    69.00   3243    3270   62966  13455    100.0    1.156  ! Near Maximum !
+01.0   98    69.69   3276    3335   65317  13504    100.0    1.137  !DANGEROUS LOAD-DO NOT USE!
+02.0   99    70.38   3307    3401   67758  13553    100.0    1.118  !DANGEROUS LOAD-DO NOT USE!
+03.0  100    71.07   3339    3466   70294  13600    100.0    1.100  !DANGEROUS LOAD-DO NOT USE!
+04.0  101    71.76   3371    3533   72929  13646    100.0    1.082  !DANGEROUS LOAD-DO NOT USE!
+05.0  102    72.45   3403    3599   75667  13690    100.0    1.065  !DANGEROUS LOAD-DO NOT USE!

Results caused by ± 10% powder lot-to-lot burning rate variation using nominal charge
Data for burning rate increased by 10% relative to nominal value:
+Ba     97    69.00   3376    3544   78454  12934    100.0    1.058  !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 10% relative to nominal value:
-Ba     97    69.00   3038    2868   48385  13988     98.8    1.288

Cartridge          : .270 WSM
Bullet             : .277, 140, Nosler AccuBond 54765
Useable Case Capaci: 71.442 grain H2O = 4.639 cm³
Cartridge O.A.L. L6: 2.860 inch = 72.64 mm
Barrel Length      : 24.0 inch = 609.6 mm

Predicted Data for Indicated Charges of the Following Powders.
Matching Maximum Pressure: 63250 psi, or 436 MPa
or a maximum loading ratio or filling of 112 %
These calculations refer to your specified settings in QuickLOAD 'Cartridge Dimensions' window.
C A U T I O N : any load listed can result in a powder charge that falls below minimum suggested
loads or exceeds maximum suggested loads as presented in current handloading manuals. Understand
that all of the listed powders can be unsuitable for the given combination of cartridge, bullet
and gun. Actual load order can vary, depending upon lot-to-lot powder and component variations.
USE ONLY FOR COMPARISON !

19 loads produced a Loading Ratio below user-defined minimum of 90%. These powders have been skipped.
Powder type          Filling/Loading Ratio  Charge    Charge   Vel. Prop.Burnt P max  P muzz  B_Time
                                      %     Grains    Gramm   fps     %       psi     psi    ms
---------------------------------  -----------------------------------------------------------------
Vihtavuori N570                    109.6     76.1     4.93    3298    96.4    63250   15515   1.135  ! Near Maximum !
Alliant Reloder-33                 111.3     79.5     5.15    3281    96.7    63250   15298   1.136  ! Near Maximum !
ReloadSwiss RS 80                  112.0     80.0     5.18    3263    97.1    61918   15200   1.144  ! Near Maximum !
ADI AR 2218                        112.0     78.6     5.09    3251    95.7    61067   15601   1.138  ! Near Maximum !
Alliant Reloder-26                  97.6     69.1     4.48    3247   100.0    63250   13461   1.153  ! Near Maximum !
Bofors RP30                        108.7     71.6     4.64    3237    99.5    63250   14089   1.149  ! Near Maximum !
Norma MRP 2                        108.7     71.6     4.64    3237    99.5    63250   14089   1.149  ! Near Maximum !
PB Clermont PCL 517                103.3     72.6     4.71    3235    99.5    63250   13829   1.133  ! Near Maximum !
SNPE Vectan SP 12                  103.1     72.5     4.70    3234    99.5    63250   13802   1.134  ! Near Maximum !
Alliant Reloder-25                 106.6     69.8     4.52    3233   100.0    63250   13115   1.137  ! Near Maximum !
Vihtavuori N560                    100.5     67.6     4.38    3233    98.9    63250   14094   1.140  ! Near Maximum !
Norma MRP                           98.7     67.8     4.39    3232   100.0    63250   13648   1.146  ! Near Maximum !
ReloadSwiss RS 70                   95.8     67.2     4.36    3228   100.0    63250   13236   1.131  ! Near Maximum !
Hodgdon Retumbo                    112.0     74.2     4.81    3226   100.0    60245   13786   1.155  ! Near Maximum !
ADI AR 2225                        112.0     74.2     4.81    3226   100.0    60245   13786   1.155  ! Near Maximum !
IMR 7828                           105.0     67.2     4.35    3224    99.2    63250   13661   1.129  ! Near Maximum !
IMR 7828 SSC                        99.3     67.2     4.35    3224    99.2    63250   13661   1.129  ! Near Maximum !
Accurate MAGPRO                    100.7     70.5     4.57    3222    97.9    63250   14192   1.147  ! Near Maximum !
ADI AR 2213                        100.4     66.8     4.33    3211    99.1    63250   13543   1.127  ! Near Maximum !
ADI AP 2214                        104.2     71.3     4.62    3206    99.4    63250   13357   1.125  ! Near Maximum !
Bofors RP5/NP ~approximation       100.8     67.1     4.35    3206    99.7    63250   13510   1.146  ! Near Maximum !
Alliant Reloder-22                 100.8     67.1     4.35    3206    99.7    63250   13510   1.146  ! Near Maximum !
Raufoss RA15                       100.8     67.1     4.35    3206    99.7    63250   13510   1.146  ! Near Maximum !
Winchester WXR                     103.5     67.4     4.37    3205    99.7    63250   13529   1.146  ! Near Maximum !
Bofors RP15                        103.5     67.4     4.37    3205    99.7    63250   13529   1.146  ! Near Maximum !
Hodgdon H1000                      109.6     71.4     4.63    3204    99.4    63250   13318   1.125  ! Near Maximum !
ADI AR 2217                        109.6     71.4     4.63    3204    99.4    63250   13318   1.125  ! Near Maximum !
Ramshot Magnum                     100.5     72.1     4.67    3185   100.0    63250   12888   1.141  ! Near Maximum !
Bofors RP5 NT ~approximation       104.0     69.8     4.53    3176    97.6    63250   13391   1.130  ! Near Maximum !
Rottweil R905                      102.1     66.7     4.32    3176    98.8    63250   13245   1.144  ! Near Maximum !
ADI AR 2209                         97.3     63.7     4.13    3168    99.6    63250   12845   1.133  ! Near Maximum !
Alliant Reloder-19                  97.8     64.4     4.17    3165    99.7    63250   12905   1.140  ! Near Maximum !
Vihtavuori 24N41                   111.6     78.3     5.07    3164    90.3    63250   13854   1.132  ! Near Maximum !
Alliant Reloder-23                 103.1     66.4     4.30    3162   100.0    63250   12143   1.155  ! Near Maximum !
Bofors RP14 ~approximation          98.5     64.9     4.20    3158    99.7    63250   12814   1.141  ! Near Maximum !
PB Clermont PCL 518                 94.1     64.0     4.15    3157   100.0    63250   12517   1.147  ! Near Maximum !
PB Clermont PCL 511                 90.4     63.4     4.11    3154   100.0    63250   12424   1.147  ! Near Maximum !
Ramshot Hunter                      93.4     63.5     4.12    3153   100.0    63250   12407   1.148  ! Near Maximum !
ReloadSwiss RS 62                   91.8     63.4     4.11    3148   100.0    63250   12171   1.161  ! Near Maximum !
Alliant Reloder-16                  94.8     60.8     3.94    3148   100.0    63250   11928   1.154  ! Near Maximum !
Norma 204                           92.9     63.2     4.09    3143    99.6    63250   12600   1.140  ! Near Maximum !
Raufoss RA4                         95.9     63.2     4.09    3143    99.6    63250   12600   1.140  ! Near Maximum !
Bofors RP4 ~approximation           95.9     63.2     4.09    3143    99.6    63250   12600   1.140  ! Near Maximum !
Hodgdon H4831                      103.1     66.0     4.27    3143    98.6    63250   12791   1.137  ! Near Maximum !
Hodgdon H4831 SC                    99.1     66.0     4.27    3143    98.6    63250   12791   1.137  ! Near Maximum !
Norma 217                          112.0     72.6     4.71    3135    99.7    53927   14094   1.232
Vihtavuori N550                     90.4     60.8     3.94    3130   100.0    63250   12033   1.156  ! Near Maximum !
Norma URP                           93.0     60.6     3.92    3129   100.0    63250   11894   1.153  ! Near Maximum !
Bofors RP19 ~approximation          93.0     60.6     3.93    3129   100.0    63250   11890   1.153  ! Near Maximum !
Somchem S365                        94.7     62.0     4.02    3127   100.0    63250   11532   1.161  ! Near Maximum !
Somchem S385                        98.0     65.2     4.23    3124    99.9    63250   12303   1.160  ! Near Maximum !
Hodgdon H870                       112.0     76.2     4.94    3124    96.2    54339   14541   1.221
Accurate 4350                       92.1     60.6     3.93    3123   100.0    63250   11852   1.171  ! Near Maximum !
Rottweil R904                       96.8     62.9     4.07    3116    99.1    63250   12338   1.140  ! Near Maximum !
Winchester Supreme 780              96.5     67.0     4.34    3116    99.6    63250   12269   1.146  ! Near Maximum !
Bofors RP4 NT ~approximation        93.6     62.6     4.06    3115   100.0    63250   12091   1.152  ! Near Maximum !
IMR 4831                            97.5     61.5     3.99    3109   100.0    63250   11637   1.162  ! Near Maximum !
Vihtavuori N170                    112.0     73.0     4.73    3109    94.5    62276   13127   1.167  ! Near Maximum !
Vihtavuori N165                    103.1     67.2     4.35    3109    99.8    63250   12033   1.151  ! Near Maximum !
IMR 4955 Enduron                   100.4     64.3     4.17    3109    98.7    63250   12400   1.139  ! Near Maximum !
Accurate 3100                      100.9     66.4     4.30    3105   100.0    63250   11895   1.176  ! Near Maximum !
Lovex S071                         106.7     66.4     4.30    3105   100.0    63250   11895   1.176  ! Near Maximum !
Alliant Reloder-50                 112.0     79.8     5.17    3103    93.6    52963   14978   1.255
Lovex S070                          92.9     60.5     3.92    3101   100.0    63250   11883   1.158  ! Near Maximum !
Vihtavuori N160                    103.3     65.2     4.23    3098    99.0    63250   12109   1.143  ! Near Maximum !
Lovex D100                         109.0     77.3     5.01    3092    91.1    63250   12831   1.148  ! Near Maximum !
Bofors RP7                          91.0     58.8     3.81    3086    99.9    63250   11756   1.150  ! Near Maximum !
Rottweil R907                       91.0     58.8     3.81    3086    99.9    63250   11756   1.150  ! Near Maximum !
Somchem S361                        95.8     67.2     4.36    3082    98.6    63250   12101   1.152  ! Near Maximum !
Hodgdon Hybrid 100V                 95.4     60.8     3.94    3082   100.0    63250   10991   1.155  ! Near Maximum !
Lovex S065                          92.0     59.3     3.84    3076   100.0    63250   11423   1.157  ! Near Maximum !
IMR 7977 Enduron                   104.8     68.3     4.43    3047    92.6    63250   12032   1.141  ! Near Maximum !

 

[AFG270]

I recently started working up a load with this combination, I started at 63.0gr and I can't get anywhere near Alliants max of 69.0gr, so work up slow and be careful. I'm at 66.7gr, just over 3200 fps with a 24" barrel. There also is about 1.5gr difference from the first lot of powder I used to the second lot I'm now using, to get the same velocity.

Let us know how it works for you, my load shot 1/2" group at 100 yards, now just have to get it to repeat and try it out at 200 and 300 yards.

 

[clark33]

Due to my mag length my max coal is 2.830.

I loaded up 5 rounds each at 66.0, 66.5, and 67.0. Looks like I may run into pressure before I get to my 67.0 loads but that’s ok, I can pull them.

 

[DrMike]

It doesn't introduce much difference in velocity and/or maximum chamber pressure. It actually boosts these values slightly.

Cartridge          : .270 WSM
Bullet             : .277, 140, Nosler AccuBond 54765
Useable Case Capaci: 70.979 grain H2O = 4.609 cm³
Cartridge O.A.L. L6: 2.830 inch = 71.88 mm
Barrel Length      : 24.0 inch = 609.6 mm
Powder             : Alliant Reloder-26

Predicted data by increasing and decreasing the given charge,
incremented in steps of 1.0% of nominal charge.
CAUTION: Figures exceed maximum and minimum recommended loads !

Step    Fill. Charge   Vel.  Energy   Pmax   Pmuz  Prop.Burnt B_Time
 %       %    Grains   fps   ft.lbs    psi    psi      %        ms

-10.0   88    61.92   2915    2641   43734  12789     99.7    1.363
-09.0   89    62.61   2949    2703   45369  12875     99.8    1.341
-08.0   90    63.30   2983    2765   47068  12952     99.9    1.318
-07.0   91    63.98   3016    2828   48838  13020    100.0    1.296
-06.0   92    64.67   3050    2891   50681  13078    100.0    1.274
-05.0   93    65.36   3083    2954   52586  13133    100.0    1.253
-04.0   94    66.05   3116    3018   54556  13188    100.0    1.232  ! Near Maximum !
-03.0   95    66.74   3149    3082   56598  13241    100.0    1.212  ! Near Maximum !
-02.0   96    67.42   3181    3146   58717  13293    100.0    1.192  ! Near Maximum !
-01.0   97    68.11   3214    3211   60916  13345    100.0    1.172  ! Near Maximum !
+00.0   98    68.80   3246    3276   63199  13395    100.0    1.153  ! Near Maximum !
+01.0   99    69.49   3278    3341   65570  13443    100.0    1.134  !DANGEROUS LOAD-DO NOT USE!
+02.0  100    70.18   3310    3406   68033  13491    100.0    1.116  !DANGEROUS LOAD-DO NOT USE!
+03.0  101    70.86   3342    3472   70591  13537    100.0    1.098  !DANGEROUS LOAD-DO NOT USE!
+04.0  102    71.55   3374    3539   73250  13582    100.0    1.080  !DANGEROUS LOAD-DO NOT USE!
+05.0  103    72.24   3406    3606   76015  13626    100.0    1.063  !DANGEROUS LOAD-DO NOT USE!

Results caused by ± 10% powder lot-to-lot burning rate variation using nominal charge
Data for burning rate increased by 10% relative to nominal value:
+Ba     98    68.80   3379    3549   78797  12874    100.0    1.056  !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 10% relative to nominal value:
-Ba     98    68.80   3040    2873   48557  13930     98.8    1.286

 

[clark33]

It doesn't introduce much difference in velocity and/or maximum chamber pressure. It actually boosts these values slightly.

Cartridge          : .270 WSM
Bullet             : .277, 140, Nosler AccuBond 54765
Useable Case Capaci: 70.979 grain H2O = 4.609 cm³
Cartridge O.A.L. L6: 2.830 inch = 71.88 mm
Barrel Length      : 24.0 inch = 609.6 mm
Powder             : Alliant Reloder-26

Predicted data by increasing and decreasing the given charge,
incremented in steps of 1.0% of nominal charge.
CAUTION: Figures exceed maximum and minimum recommended loads !

Step    Fill. Charge   Vel.  Energy   Pmax   Pmuz  Prop.Burnt B_Time
 %       %    Grains   fps   ft.lbs    psi    psi      %        ms

-10.0   88    61.92   2915    2641   43734  12789     99.7    1.363
-09.0   89    62.61   2949    2703   45369  12875     99.8    1.341
-08.0   90    63.30   2983    2765   47068  12952     99.9    1.318
-07.0   91    63.98   3016    2828   48838  13020    100.0    1.296
-06.0   92    64.67   3050    2891   50681  13078    100.0    1.274
-05.0   93    65.36   3083    2954   52586  13133    100.0    1.253
-04.0   94    66.05   3116    3018   54556  13188    100.0    1.232  ! Near Maximum !
-03.0   95    66.74   3149    3082   56598  13241    100.0    1.212  ! Near Maximum !
-02.0   96    67.42   3181    3146   58717  13293    100.0    1.192  ! Near Maximum !
-01.0   97    68.11   3214    3211   60916  13345    100.0    1.172  ! Near Maximum !
+00.0   98    68.80   3246    3276   63199  13395    100.0    1.153  ! Near Maximum !
+01.0   99    69.49   3278    3341   65570  13443    100.0    1.134  !DANGEROUS LOAD-DO NOT USE!
+02.0  100    70.18   3310    3406   68033  13491    100.0    1.116  !DANGEROUS LOAD-DO NOT USE!
+03.0  101    70.86   3342    3472   70591  13537    100.0    1.098  !DANGEROUS LOAD-DO NOT USE!
+04.0  102    71.55   3374    3539   73250  13582    100.0    1.080  !DANGEROUS LOAD-DO NOT USE!
+05.0  103    72.24   3406    3606   76015  13626    100.0    1.063  !DANGEROUS LOAD-DO NOT USE!

Results caused by ± 10% powder lot-to-lot burning rate variation using nominal charge
Data for burning rate increased by 10% relative to nominal value:
+Ba     98    68.80   3379    3549   78797  12874    100.0    1.056  !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 10% relative to nominal value:
-Ba     98    68.80   3040    2873   48557  13930     98.8    1.286

Very helpful! Thank you sir!

 

[SJB358]

I’ve been using 26 in my 270 WSM quite a lot with 150’s. It’s a steamer with 150 Partitions and BBCs.



67.5 was where I settled.

 

[AFG270]

Wow, that is some amazing velocity and excellent accuracy. How long is your barrel?

I started getting pressure signs with 150gr Speer BTSP and RL26 at 65.8g with a velocity of 3161 fps. Just goes to show every gun is different.

 

[SJB358]

Wow, that is some amazing velocity and excellent accuracy. How long is your barrel?

I started getting pressure signs with 150gr Speer BTSP and RL26 at 65.8g with a velocity of 3161 fps. Just goes to show every gun is different.

24” AFG.

No pressure in these, even above but it seems very good right at 3200.

 

[jason miller]

I'm starting to wonder how big Scotty's gun safe is. Seems like you've got one of everything!

 

[clark33]

In my 22in barrel 270wsm:

67.0gr shot the best and averaged 3130fps with the 140 AB. No sticky bolt, and primers looked good.

I shot them at 200 yards and had some horizontal stringing, but I'm attributing that to 1)myself, been a while since I have shot and could tell I wasn't being very consistent in my fundamentals. 2) had about a 15mph cross wind.

I'll test this load again in more favorable conditions. No vertical stringing though which is good.