The minimum impact speed for reliable opening varies with the bullet construction. Partitions open reliably if they hit the target going 1800 FPS. So do Barnes, and, IIRC, Hornady bullets. Sierra and Speer cup and core bullets require about 2100 FPS minimum impact speed.
You might do best with a bullet designed for use in pistols if you can find one or with ballistic tips.
Last edited by denton; 11/11/14.
