Jus my .02 but of the powders you listed I would start with 3 4831, Rl17 and 4350 in tha order. Frankly it sounds as if we are hunting in similar circumstance and after using 130 core lock bullets with mediocre results I have decided to try the 150s . I have used core locks in other cartridges w great results and have decided that my issues may be the other rounds I have are loaded to 2700-2800 fps while the 270 is 3000+. At closer ranges I suspect that the impact velocity is still too high with the 130 gr bullets. So I might suggest targeting a muzzle velocity of 2800 as out to 300 yds anything higher has more potential issues at shorter shôts than reward at 250-300 for your intended target.
Last edited by bangeye; 09/01/17.
