Retumbo replacement for 30-378 WEA?

J

Jimbeaux82

Handloader
Jan 6, 2011
408
179
Since Retumbo is unavailable for the foreseeable future, can someone recommend the next best replacement for it using 180 gr Accubonds? IMR 8133?

Maybe Dr Mike would kindly run a 30-378 Wea QL using 180 gr AB, Wea cases, Fed 215 primers??

Please , pretty please?

TIA

Jimbeaux
 
Code: 
Cartridge          : .30-378 Weath. Mag.
Bullet             : .308, 180, Nosler AccuBond 54825
Useable Case Capaci: 121.261 grain H2O = 7.873 cm³
Cartridge O.A.L. L6: 3.655 inch = 92.84 mm
Barrel Length      : 24.0 inch = 609.6 mm
Powder             : Alliant Reloder-33 *C

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   87   105.93   2884    3324   43982  16831     94.4    1.452
-09.0   88   107.11   2921    3411   45602  17059     95.0    1.426
-08.0   89   108.28   2959    3500   47281  17279     95.6    1.402
-07.0   90   109.46   2997    3590   49021  17491     96.2    1.377
-06.0   91   110.64   3035    3681   50825  17694     96.7    1.353
-05.0   92   111.82   3072    3773   52695  17887     97.2    1.330
-04.0   93   112.99   3110    3866   54633  18071     97.7    1.307  ! Near Maximum !
-03.0   94   114.17   3148    3961   56643  18246     98.1    1.285  ! Near Maximum !
-02.0   95   115.35   3186    4057   58728  18410     98.5    1.263  ! Near Maximum !
-01.0   96   116.52   3224    4153   60891  18563     98.8    1.241  ! Near Maximum !
+00.0   97   117.70   3261    4251   63134  18705     99.1    1.220  ! Near Maximum !
+01.0   98   118.88   3299    4349   65462  18836     99.3    1.199  !DANGEROUS LOAD-DO NOT USE!
+02.0   99   120.05   3336    4449   67879  18955     99.6    1.179  !DANGEROUS LOAD-DO NOT USE!
+03.0  100   121.23   3374    4549   70389  19061     99.7    1.158  !DANGEROUS LOAD-DO NOT USE!
+04.0  101   122.41   3411    4650   72995  19155     99.9    1.139  !DANGEROUS LOAD-DO NOT USE!
+05.0  102   123.59   3448    4752   75703  19237    100.0    1.119  !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   117.70   3443    4739   77688  18174    100.0    1.110  !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 10% relative to nominal value:
-Ba     97   117.70   3007    3614   48991  18010     92.5    1.366

You didn't specify barrel length, so I went with 24 inch. Chamber Pressure will remain the same.

Code: 
Cartridge          : .30-378 Weath. Mag.
Bullet             : .308, 180, Nosler AccuBond 54825
Useable Case Capaci: 121.261 grain H2O = 7.873 cm³
Cartridge O.A.L. L6: 3.655 inch = 92.84 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 !

64 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
---------------------------------  -----------------------------------------------------------------
ADI AR 2218                         99.9    118.9     7.71    3334    99.4    63250   19534   1.185  ! Near Maximum !
Vihtavuori N570 *C                  95.4    112.5     7.29    3282    98.8    63250   19006   1.213  ! Near Maximum !
Alliant Reloder-33 *C               97.1    117.8     7.63    3263    99.1    63250   18713   1.218  ! Near Maximum !
ReloadSwiss RS 76 *C                92.0    110.7     7.17    3262   100.0    63250   17205   1.213  ! Near Maximum !
Hodgdon H870                       101.3    116.9     7.57    3252    99.7    63250   18218   1.221  ! Near Maximum !
Alliant Reloder-50 *C              101.2    122.3     7.93    3250    98.8    63250   19063   1.247  ! Near Maximum !
ReloadSwiss RS 80 *C                94.6    114.7     7.43    3245    99.9    63250   17992   1.226  ! Near Maximum !
Hodgdon Retumbo                     98.8    111.0     7.20    3232   100.0    63250   16502   1.207  ! Near Maximum !
ADI AR 2225                         98.8    111.0     7.20    3232   100.0    63250   16502   1.207  ! Near Maximum !
Norma 217 *C                       100.8    110.9     7.19    3230   100.0    63250   16969   1.231  ! Near Maximum !
IMR 7828                            92.1    100.1     6.48    3222   100.0    63250   16567   1.189  ! Near Maximum !
Bofors RP30                         94.9    106.1     6.87    3217   100.0    63250   16895   1.217  ! Near Maximum !
Norma MRP 2 *C                      94.9    106.1     6.87    3217   100.0    63250   16895   1.217  ! Near Maximum !
PB Clermont PCL 517                 90.4    107.9     6.99    3216   100.0    63250   16649   1.207  ! Near Maximum !
SNPE Vectan SP 12                   90.3    107.7     6.98    3215   100.0    63250   16610   1.207  ! Near Maximum !
ADI AP 2214                         91.8    106.5     6.90    3209   100.0    63250   16197   1.189  ! Near Maximum !
Hodgdon 50BMG                      104.2    118.3     7.67    3208    91.6    63250   18174   1.200  ! Near Maximum !
Vihtavuori 24N41 *C                 99.0    117.9     7.64    3208    95.0    63250   17740   1.193  ! Near Maximum !
ADI AR 2217                         96.5    106.7     6.92    3207   100.0    63250   16155   1.189  ! Near Maximum !
Hodgdon H1000 *T                    96.5    106.7     6.92    3207   100.0    63250   16155   1.189  ! Near Maximum !
Accurate 8700                      106.0    123.6     8.01    3207    98.8    63250   17376   1.209  ! Near Maximum !
Bofors 12,7mmRA NC1214 Lot20115087 102.1    120.7     7.82    3202    93.0    63250   18634   1.243  ! Near Maximum !
Vihtavuori N565 *C                  92.0    105.6     6.84    3201   100.0    63250   16812   1.222  ! Near Maximum !
Vihtavuori 20N29 *C                105.9    127.4     8.26    3198    97.1    63250   17880   1.226  ! Near Maximum !
Bofors RP15                         90.8    100.4     6.51    3198   100.0    63250   16250   1.202  ! Near Maximum !
Winchester WXR                      90.8    100.4     6.51    3198   100.0    63250   16250   1.202  ! Near Maximum !
Bofors RP5 NT *C ~approximation     92.1    104.9     6.80    3195    99.6    63250   16502   1.182  ! Near Maximum !
Alliant Reloder-25 *C               92.8    103.1     6.68    3192   100.0    63250   15680   1.207  ! Near Maximum !
Hodgdon US 869                     103.8    123.6     8.01    3191    95.1    63250   17726   1.210  ! Near Maximum !
PB Clermont PCL 513/520/9520       107.4    122.6     7.95    3187    97.7    63250   17407   1.219  ! Near Maximum !
SNPE Vectan SP 13                  105.6    120.6     7.82    3185    98.5    63250   17224   1.220  ! Near Maximum !
Hodgdon H4831 *T                    91.4     99.3     6.44    3165    99.9    63250   15719   1.185  ! Near Maximum !
NC A3502 ,test only                112.0    122.5     7.94    3163    86.8    59203   18709   1.204  ! Near Maximum !
Somchem 12.7-0                     104.7    120.9     7.83    3160    91.6    63250   17008   1.192  ! Near Maximum !
Vihtavuori N170 *C                  99.7    110.3     7.15    3157    98.0    63250   16547   1.211  ! Near Maximum !
Lovex D100                          97.1    116.8     7.57    3142    95.6    63250   16459   1.203  ! Near Maximum !
Vihtavuori N160 *C                  92.0     98.6     6.39    3126   100.0    63250   14876   1.185  ! Near Maximum !
Vihtavuori N165 *C                  91.2    100.9     6.54    3117   100.0    63250   14585   1.201  ! Near Maximum !
IMR 7977 Enduron *C*T               94.2    104.2     6.75    3115    96.7    63250   15486   1.177  ! Near Maximum !
 
Thanks Dr Mike.

I am shooting a 26" barrel so you think I might gain 50 fps?

Jimbeaux
 
Code: 
Cartridge          : .30-378 Weath. Mag.
Bullet             : .308, 180, Nosler AccuBond 54825
Useable Case Capaci: 121.261 grain H2O = 7.873 cm³
Cartridge O.A.L. L6: 3.655 inch = 92.84 mm
Barrel Length      : 26.0 inch = 660.4 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 !

64 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
---------------------------------  -----------------------------------------------------------------
ADI AR 2218                         99.9    118.9     7.71    3418    99.8    63250   17788   1.234  ! Near Maximum !
Vihtavuori N570 *C                  95.4    112.5     7.29    3366    99.3    63250   17356   1.263  ! Near Maximum !
Alliant Reloder-33 *C               97.1    117.8     7.63    3346    99.5    63250   17081   1.269  ! Near Maximum !
ReloadSwiss RS 76 *C                92.0    110.7     7.17    3338   100.0    63250   15621   1.264  ! Near Maximum !
Alliant Reloder-50 *C              101.2    122.3     7.93    3334    99.3    63250   17412   1.298  ! Near Maximum !
Hodgdon H870                       101.3    116.9     7.57    3332    99.9    63250   16580   1.271  ! Near Maximum !
ReloadSwiss RS 80 *C                94.6    114.7     7.43    3325   100.0    63250   16350   1.276  ! Near Maximum !
Norma 217 *C                       100.8    110.9     7.19    3306   100.0    63250   15397   1.282  ! Near Maximum !
ADI AR 2225                         98.8    111.0     7.20    3306   100.0    63250   14987   1.258  ! Near Maximum !
Hodgdon Retumbo                     98.8    111.0     7.20    3306   100.0    63250   14987   1.258  ! Near Maximum !
IMR 7828                            92.1    100.1     6.48    3296   100.0    63250   15040   1.240  ! Near Maximum !
Bofors RP30                         94.9    106.1     6.87    3293   100.0    63250   15344   1.268  ! Near Maximum !
Norma MRP 2 *C                      94.9    106.1     6.87    3293   100.0    63250   15344   1.268  ! Near Maximum !
PB Clermont PCL 517                 90.4    107.9     6.99    3290   100.0    63250   15112   1.258  ! Near Maximum !
Hodgdon 50BMG                      104.2    118.3     7.67    3290    92.7    63250   16748   1.252  ! Near Maximum !
SNPE Vectan SP 12                   90.3    107.7     6.98    3289   100.0    63250   15077   1.258  ! Near Maximum !
Vihtavuori 24N41 *C                 99.0    117.9     7.64    3288    95.9    63250   16295   1.245  ! Near Maximum !
Bofors 12,7mmRA NC1214 Lot20115087 102.1    120.7     7.82    3286    94.1    63250   17159   1.294  ! Near Maximum !
Accurate 8700                      106.0    123.6     8.01    3285    99.3    63250   15852   1.260  ! Near Maximum !
ADI AP 2214                         91.8    106.5     6.90    3282   100.0    63250   14696   1.240  ! Near Maximum !
ADI AR 2217                         96.5    106.7     6.92    3279   100.0    63250   14657   1.240  ! Near Maximum !
Hodgdon H1000 *T                    96.5    106.7     6.92    3279   100.0    63250   14657   1.240  ! Near Maximum !
Vihtavuori 20N29 *C                105.9    127.4     8.26    3279    97.9    63250   16377   1.277  ! Near Maximum !
Vihtavuori N565 *C                  92.0    105.6     6.84    3276   100.0    63250   15272   1.273  ! Near Maximum !
Hodgdon US 869                     103.8    123.6     8.01    3271    96.0    63250   16285   1.262  ! Near Maximum !
Winchester WXR                      90.8    100.4     6.51    3271   100.0    63250   14778   1.254  ! Near Maximum !
Bofors RP15                         90.8    100.4     6.51    3271   100.0    63250   14778   1.254  ! Near Maximum !
Bofors RP5 NT *C ~approximation     92.1    104.9     6.80    3269    99.9    63250   15050   1.233  ! Near Maximum !
PB Clermont PCL 513/520/9520       107.4    122.6     7.95    3266    98.4    63250   15931   1.271  ! Near Maximum !
Alliant Reloder-25 *C               92.8    103.1     6.68    3263   100.0    63250   14257   1.258  ! Near Maximum !
SNPE Vectan SP 13                  105.6    120.6     7.82    3262    99.0    63250   15742   1.272  ! Near Maximum !
NC A3502 ,test only                112.0    122.5     7.94    3251    89.2    59203   17536   1.256  ! Near Maximum !
Somchem 12.7-0                     104.7    120.9     7.83    3237    92.6    63250   15654   1.244  ! Near Maximum !
Hodgdon H4831 *T                    91.4     99.3     6.44    3237   100.0    63250   14300   1.237  ! Near Maximum !
Vihtavuori N170 *C                  99.7    110.3     7.15    3233    98.6    63250   15141   1.263  ! Near Maximum !
Lovex D100                          97.1    116.8     7.57    3217    96.4    63250   15098   1.255  ! Near Maximum !
Vihtavuori N160 *C                  92.0     98.6     6.39    3194   100.0    63250   13517   1.238  ! Near Maximum !
IMR 7977 Enduron *C*T               94.2    104.2     6.75    3187    97.3    63250   14192   1.230  ! Near Maximum !
Vihtavuori N165 *C                  91.2    100.9     6.54    3184   100.0    63250   13248   1.254  ! Near Maximum !

There does appear to be some gain in velocity with the extra two inches.
 
jezzolo":azslmbpj said:
If you’re looking for retumbo there is a pile of it on gunbroker
Click to expand...

Ya, but those prices! Yikes!

I see 4 pounds of it, with the bid of $300 now.... Wow!

Guy
 
Over the years friend had two 30-378 Weatherbys. One took 113 grs of Retumbo with 180 AB and gave 3425 FPS with. 26” barrel. It was definitely a hot load as primer pockets got loose after the 3rd or 4th firing. Other gun ( first one barrel was gone after about 600-700 rounds) would only take 111 grs of Retumbo before bolt was stiff and extractor marks. It too was 26” barrel and got 3385-3400 FPS.

I wonder if QL takes Weatherby free bore into consideration?

Anyway I ll bet R33 and possibly Imr8133 would give similar performance.
 
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