257 Roberts AI Load Data

In 2 257 Roberts Ackleys H 4350, RL19 & AA3100 have worked the best for powders.

With bullet weights of 100 gr - 120 gr. Accurate Arms had some good book data,
24 " barrel can run 120 gr bullets @ 2950 FPS with great case life under MOA. One of the better Ack IMP IMHO KK
 
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