QL please for a 260 Rem

[rmarshall]

I have a 24" barreled 260 rem, I would like to try R17 and some 129 SST's, but have not data for that. Also how is R19 with the same bullet. How will it do with a 140 BT? Thanks

 

[Wyo7200]

Cool! I'm working on the same thing here, but with 129 ABLR's. Using my Lapua brass H2O cap.

Cartridge          : .260 Rem
Bullet             : .264, 129, Hornady SST InterLock 26202
Useable Case Capaci: 47.472 grain H2O = 3.082 cm³
Cartridge O.A.L. L6: 2.800 inch = 71.12 mm
Barrel Length      : 24.0 inch = 609.6 mm
Powder             : Alliant Reloder-17

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   84    38.69   2618    1964   38332   9389     98.7    1.397
-09.0   85    39.12   2647    2006   39551   9475     99.0    1.377
-08.0   86    39.55   2675    2049   40810   9557     99.2    1.357
-07.0   87    39.98   2703    2092   42109   9634     99.4    1.337
-06.0   88    40.41   2731    2136   43452   9707     99.6    1.317
-05.0   89    40.84   2759    2180   44840   9775     99.7    1.298
-04.0   90    41.27   2786    2224   46274   9838     99.9    1.280
-03.0   91    41.70   2814    2268   47755   9896     99.9    1.261
-02.0   92    42.13   2842    2313   49289   9949    100.0    1.243
-01.0   93    42.56   2869    2358   50870   9997    100.0    1.225
+00.0   94    42.99   2896    2403   52512  10042    100.0    1.208  ! Near Maximum !
+01.0   95    43.42   2923    2448   54206  10085    100.0    1.191  ! Near Maximum !
+02.0   96    43.85   2950    2493   55961  10129    100.0    1.174  ! Near Maximum !
+03.0   96    44.28   2977    2539   57775  10171    100.0    1.158  ! Near Maximum !
+04.0   97    44.71   3004    2584   59654  10213    100.0    1.142  !DANGEROUS LOAD-DO NOT USE!
+05.0   98    45.14   3030    2630   61598  10254    100.0    1.126  !DANGEROUS LOAD-DO NOT USE!

Results caused by ± 5% powder lot-to-lot burning rate variation using nominal charge
Data for burning rate increased by 5% relative to nominal value:
+Ba     94    42.99   2960    2510   58088   9814    100.0    1.160  ! Near Maximum !
Data for burning rate decreased by 5% relative to nominal value:
-Ba     94    42.99   2817    2272   47339  10225     99.4    1.263

My temp range for this caliber combo estimates out to 50-80*

Cartridge          : .260 Rem
Bullet             : .264, 129, Hornady SST InterLock 26202
Useable Case Capaci: 47.472 grain H2O = 3.082 cm³
Cartridge O.A.L. L6: 2.800 inch = 71.12 mm
Barrel Length      : 24.0 inch = 609.6 mm
Powder             : Alliant Reloder-19

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   93    40.50   2556    1871   38401   9145     91.3    1.404
-09.0   94    40.95   2585    1914   39642   9270     91.8    1.383
-08.0   95    41.40   2614    1958   40924   9393     92.4    1.362
-07.0   96    41.85   2644    2002   42249   9514     92.9    1.342
-06.0   97    42.30   2673    2047   43617   9632     93.4    1.322
-05.0   98    42.75   2703    2092   45035   9748     93.9    1.303
-04.0   99    43.20   2732    2138   46502   9861     94.4    1.284
-03.0  100    43.65   2762    2185   48018   9971     94.9    1.265
-02.0  101    44.10   2791    2231   49590  10079     95.3    1.246
-01.0  102    44.55   2821    2279   51217  10183     95.7    1.228  ! Near Maximum !
+00.0  103    45.00   2850    2327   52901  10285     96.1    1.210  ! Near Maximum !
+01.0  104    45.45   2880    2376   54647  10383     96.5    1.192  ! Near Maximum !
+02.0  105    45.90   2910    2425   56455  10478     96.9    1.175  ! Near Maximum !
+03.0  106    46.35   2939    2474   58330  10569     97.2    1.158  ! Near Maximum !
+04.0  107    46.80   2969    2525   60275  10657     97.6    1.141  !DANGEROUS LOAD-DO NOT USE!
+05.0  108    47.25   2998    2575   62291  10741     97.9    1.124  !DANGEROUS LOAD-DO NOT USE!

Results caused by ± 5% powder lot-to-lot burning rate variation using nominal charge
Data for burning rate increased by 5% relative to nominal value:
+Ba    103    45.00   2930    2459   58172  10358     98.4    1.162  ! Near Maximum !
Data for burning rate decreased by 5% relative to nominal value:
-Ba    103    45.00   2760    2182   47950  10081     92.9    1.264

140's will follow shortly.

 

[Dwh7271]

Know you didn't ask, and it's about 100 fps slower than RL17, but my 260 AI really likes 4831 SC.

 

[rmarshall]

Thanks guys for the help, I also have some 4831sc I could try too! Some 140 info is all I need know, thanks again

 

[Dwh7271]

Here's a Hornady 140 with 4831

Cartridge          : .260 Rem
Bullet             : .264, 140, Hornady SST 26302
Useable Case Capaci: 47.468 grain H2O = 3.082 cm³
Cartridge O.A.L. L6: 2.800 inch = 71.12 mm
Barrel Length      : 24.0 inch = 609.6 mm
Powder             : Hodgdon H4831 SC

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   92    40.61   2426    1829   38522   8747     90.1    1.467
-09.0   93    41.06   2454    1872   39811   8869     90.7    1.445
-08.0   94    41.51   2483    1916   41147   8989     91.3    1.423
-07.0   95    41.97   2511    1961   42530   9107     91.9    1.401
-06.0   96    42.42   2540    2006   43965   9223     92.4    1.379
-05.0   97    42.87   2569    2052   45453   9336     92.9    1.358
-04.0   98    43.32   2598    2098   46998   9447     93.5    1.337
-03.0   99    43.77   2627    2145   48600   9555     93.9    1.317
-02.0  100    44.22   2656    2192   50261   9660     94.4    1.297
-01.0  101    44.67   2685    2241   51990   9762     94.9    1.277  ! Near Maximum !
+00.0  102    45.12   2714    2289   53782   9862     95.3    1.258  ! Near Maximum !
+01.0  103    45.58   2743    2339   55647   9958     95.8    1.238  ! Near Maximum !
+02.0  104    46.03   2772    2389   57585  10051     96.2    1.220  ! Near Maximum !
+03.0  105    46.48   2801    2439   59592  10140     96.6    1.201  !DANGEROUS LOAD-DO NOT USE!
+04.0  106    46.93   2831    2491   61697  10226     96.9    1.183  !DANGEROUS LOAD-DO NOT USE!
+05.0  107    47.38   2860    2542   63880  10308     97.3    1.165  !DANGEROUS LOAD-DO NOT USE!

Results caused by ± 5% powder lot-to-lot burning rate variation using nominal charge
Data for burning rate increased by 5% relative to nominal value:
+Ba    102    45.12   2791    2422   59112   9960     97.8    1.208  ! Near Maximum !
Data for burning rate decreased by 5% relative to nominal value:
-Ba    102    45.12   2627    2145   48772   9643     91.9    1.313

Nosler BT with 4831

Cartridge          : .260 Rem
Bullet             : .264, 140, Nosler BalTip 26140
Useable Case Capaci: 48.259 grain H2O = 3.133 cm³
Cartridge O.A.L. L6: 2.800 inch = 71.12 mm
Barrel Length      : 24.0 inch = 609.6 mm
Powder             : Hodgdon H4831 SC

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   91    40.87   2421    1823   38027   8832     90.1    1.476
-09.0   92    41.32   2450    1865   39287   8956     90.7    1.453
-08.0   93    41.78   2478    1909   40592   9078     91.3    1.431
-07.0   94    42.23   2507    1953   41943   9197     91.8    1.409
-06.0   95    42.69   2535    1998   43344   9315     92.4    1.388
-05.0   96    43.14   2564    2043   44796   9430     92.9    1.366
-04.0   97    43.59   2592    2089   46301   9542     93.4    1.345
-03.0   98    44.05   2621    2136   47862   9652     93.9    1.325
-02.0   99    44.50   2650    2183   49480   9759     94.4    1.305
-01.0  100    44.96   2679    2231   51161   9864     94.8    1.285
+00.0  101    45.41   2708    2279   52906   9965     95.3    1.266  ! Near Maximum !
+01.0  102    45.86   2736    2328   54717  10063     95.7    1.247  ! Near Maximum !
+02.0  103    46.32   2765    2377   56598  10158     96.1    1.228  ! Near Maximum !
+03.0  104    46.77   2794    2427   58551  10250     96.5    1.210  ! Near Maximum !
+04.0  105    47.23   2823    2478   60586  10338     96.9    1.191  !DANGEROUS LOAD-DO NOT USE!
+05.0  106    47.68   2853    2530   62700  10422     97.2    1.173  !DANGEROUS LOAD-DO NOT USE!

Results caused by ± 5% powder lot-to-lot burning rate variation using nominal charge
Data for burning rate increased by 5% relative to nominal value:
+Ba    101    45.41   2785    2411   58143  10068     97.8    1.216  ! Near Maximum !
Data for burning rate decreased by 5% relative to nominal value:
-Ba    101    45.41   2621    2135   47980   9741     91.9    1.322

RL17

Cartridge          : .260 Rem
Bullet             : .264, 140, Nosler BalTip 26140
Useable Case Capaci: 48.259 grain H2O = 3.133 cm³
Cartridge O.A.L. L6: 2.800 inch = 71.12 mm
Barrel Length      : 24.0 inch = 609.6 mm
Powder             : Alliant Reloder-17

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   85    39.89   2629    2149   44191   9480    100.0    1.370
-09.0   86    40.33   2656    2192   45646   9534    100.0    1.350
-08.0   87    40.77   2682    2236   47147   9586    100.0    1.331
-07.0   88    41.22   2708    2280   48701   9637    100.0    1.311
-06.0   89    41.66   2734    2324   50306   9687    100.0    1.292
-05.0   90    42.10   2760    2369   51966   9737    100.0    1.274  ! Near Maximum !
-04.0   91    42.55   2786    2413   53686   9785    100.0    1.255  ! Near Maximum !
-03.0   92    42.99   2812    2458   55464   9834    100.0    1.237  ! Near Maximum !
-02.0   93    43.43   2837    2503   57305   9881    100.0    1.220  ! Near Maximum !
-01.0   94    43.88   2863    2548   59208   9928    100.0    1.203  ! Near Maximum !
+00.0   95    44.32   2888    2593   61180   9974    100.0    1.186  !DANGEROUS LOAD-DO NOT USE!
+01.0   96    44.76   2913    2638   63201  10019    100.0    1.169  !DANGEROUS LOAD-DO NOT USE!
+02.0   97    45.21   2938    2684   65338  10064    100.0    1.153  !DANGEROUS LOAD-DO NOT USE!
+03.0   98    45.65   2963    2730   67530  10108    100.0    1.137  !DANGEROUS LOAD-DO NOT USE!
+04.0   99    46.09   2988    2776   69801  10151    100.0    1.121  !DANGEROUS LOAD-DO NOT USE!
+05.0  100    46.54   3013    2823   72153  10193    100.0    1.106  !DANGEROUS LOAD-DO NOT USE!

Results caused by ± 5% powder lot-to-lot burning rate variation using nominal charge
Data for burning rate increased by 5% relative to nominal value:
+Ba     95    44.32   2939    2685   67773   9778    100.0    1.141  !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 5% relative to nominal value:
-Ba     95    44.32   2825    2480   54981  10213    100.0    1.237  ! Near Maximum !

RL19

Cartridge          : .260 Rem
Bullet             : .264, 140, Nosler BalTip 26140
Useable Case Capaci: 48.259 grain H2O = 3.133 cm³
Cartridge O.A.L. L6: 2.800 inch = 71.12 mm
Barrel Length      : 24.0 inch = 609.6 mm
Powder             : Alliant Reloder-19

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   90    39.89   2463    1886   38646   9141     93.3    1.465
-09.0   91    40.33   2491    1929   39868   9257     93.8    1.444
-08.0   92    40.77   2518    1971   41131   9372     94.3    1.423
-07.0   93    41.22   2545    2014   42431   9484     94.8    1.403
-06.0   94    41.66   2573    2058   43779   9593     95.2    1.382
-05.0   95    42.10   2600    2101   45171   9700     95.7    1.362
-04.0   96    42.55   2627    2146   46608   9804     96.1    1.343
-03.0   97    42.99   2655    2191   48093   9905     96.4    1.324
-02.0   98    43.43   2682    2236   49626  10003     96.8    1.305
-01.0   99    43.88   2709    2282   51214  10097     97.2    1.286  ! Near Maximum !
+00.0  100    44.32   2737    2328   52855  10189     97.5    1.268  ! Near Maximum !
+01.0  101    44.76   2764    2375   54549  10278     97.8    1.250  ! Near Maximum !
+02.0  102    45.21   2791    2422   56306  10362     98.1    1.233  ! Near Maximum !
+03.0  103    45.65   2818    2469   58123  10444     98.4    1.215  ! Near Maximum !
+04.0  104    46.09   2845    2517   60002  10522     98.6    1.198  !DANGEROUS LOAD-DO NOT USE!
+05.0  105    46.54   2873    2565   61948  10596     98.8    1.181  !DANGEROUS LOAD-DO NOT USE!

Results caused by ± 5% powder lot-to-lot burning rate variation using nominal charge
Data for burning rate increased by 5% relative to nominal value:
+Ba    100    44.32   2808    2451   58081  10196     99.2    1.219  ! Near Maximum !
Data for burning rate decreased by 5% relative to nominal value:
-Ba    100    44.32   2654    2190   47886  10051     94.7    1.323

 

[shoots_5]

IMR 4451 & H4350 are also excellent powders in the 260 with those bullet weights. I've had very good luck with both in mine.


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