I love the 120 Hornady HP, and have great success with it for many years in a 257AI. Here’s what a Hornady rep said about that bullet in an email, years ago:
“
The 120 gr hollow point in the .257 was made for heaver game like mule deer and elk. It has a base of .040" and a side wall of .028" and the 117 gr BTSP has a base of .035" and a wall thickness of .021" . But they both are .011" on the nose section so that the bullets can open reliably. You will see more retained weight with the 120 gr bullet.”
