Its based on a 375 RUM.The 300 had to much neck thinning
and the 338 RUM did not have the case capacity needed.
As far as recoil the 350 gr load produces 58.6 ftlbs of
recoil. About the same as a 30/378 accumark (59.5 ftlbs
of recoil. but 17.7 recoil velocity compared to 22.6
recoil velocity of the 30/378 in a 7.5lb rifle. (the BUFF
But it is exciting with no muzzle brake
J E CUSTOM