257 Roberts AI Load Data

[Henry Haina]

Anyone have suggestions for 257 Roberts AI load data. I have a new rifle and will need to start from scratch.

 

[kk alaska]

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