Picked up a fairly well used 375 Big Bore for the canoe. When it shot 200 grain Factory bullets 2037ft/sec) into 5" groups I wondered. An old box of 250 grain discontinued power point factory loads (1770ft/sec) went into about 2.75 inches and with open sights I find that satisfactory. 255 grain Barnes's and Rl 7 (1850ft/sec) can get into just over 3" groups. However 235 Speer Bullets chucked into the lathe for Flat Pointing to 229 grains and given a cannelure and enough RL7 to get to 2025 ft/sec are giving me the best groups yet. The bullet also out penetrates everything else tried. It expands but I don't know how far out. Wish the 220 Hornady's where still being made.
Video Here
https://www.youtube.com/watch?v=oKNY261k8yQ&feature=youtu.be
