270 A-Bolt: Using H4831SC with 140gr. AccuBond

[DaveB]

I am new to the forum so I hope someone can help me out! I have had very good results using H4831SC powder on both 130g and 150g Ballistic Tip bullets, but I want to also load 140g AccuBond bullets. Nosler reloading data gives you loads for the 130 and 150 grain bullets and H4831, but does not use H4831 or H4831SC in testing 140g bullets. The several suggestions I found on the forum for the starting point for this load, when compared with the 130/150 loading data seemed somewhat high.

Is it safe to take the 130g loading data and the 150g loading data and use the averages of the two to work up a load for the 140g bullet?

 

[longwinters]

Dave,

Welcome to the forum. I load for a son and son in law for their 270's. Both are using 140 Accubonds with 58.5-59 gns of H4831sc and CCI primers. Accuracy is sub MOA. Of course always work your way up with loads.

I use the exact same loads for my 280 and it works great (of course with .284 bullets not .277) :grin:

If you can get a hold of John Barsness article "Handloads That Work" he gives his favorite loads for a host of the more common calibers and I have had excellent luck with using his info for my own rifles. I have the article, but I have seen it on-line. If you do a search I would think you could find it.

http://www.loaddata.com/articles/PDF/Ha ... 20Work.pdf

Good luck

Long

 

[FOTIS]

BTW RL 22 works great also!



Cartridge : .270 Win.
Bullet : .277, 140, NOS AccuBond 54765
Cartridge O.A.L. L6: 3.340 inch or 84.84 mm
Barrel Length : 22.0 inch or 558.8 mm
Powder : Hodgdon H4831 SC

Predicted data by increasing and decreasing the given charge,
incremented in steps of 2.0% 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

-20.0 83 47.20 2278 1613 29215 9569 81.6 1.480
-18.0 86 48.38 2341 1703 31261 9953 83.3 1.441
-16.0 88 49.56 2404 1797 33459 10332 85.0 1.402
-14.0 90 50.74 2468 1894 35825 10704 86.5 1.364
-12.0 92 51.92 2533 1995 38373 11068 88.1 1.321
-10.0 94 53.10 2599 2099 41120 11422 89.5 1.278
-08.0 96 54.28 2665 2208 44084 11764 90.9 1.235
-06.0 98 55.46 2732 2320 47289 12091 92.2 1.195
-04.0 100 56.64 2799 2435 50758 12403 93.4 1.155
-02.0 102 57.82 2867 2555 54519 12696 94.6 1.117 ! Near Maximum !
+00.0 104 59.00 2935 2678 58587 12970 95.6 1.080 ! Near Maximum !
+02.0 106 60.18 3004 2805 63047 13222 96.5 1.044 !DANGEROUS LOAD-DO NOT USE!
+04.0 109 61.36 3073 2936 67896 13449 97.4 1.010 !DANGEROUS LOAD-DO NOT USE!
+06.0 111 62.54 3143 3070 73194 13650 98.1 0.976 !DANGEROUS LOAD-DO NOT USE!
+08.0 113 63.72 3212 3208 79001 13824 98.7 0.944 !DANGEROUS LOAD-DO NOT USE!
+10.0 115 64.90 3282 3349 85381 13966 99.2 0.912 !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 104 59.00 3104 2996 70604 13063 99.6 0.996 !DANGEROUS LOAD-DO NOT USE!
Data for burning rate decreased by 10% relative to nominal value:
-Ba 104 59.00 2719 2298 47972 12132 87.1 1.187