I have used a number of bullets in a .30-40 and a .300 Savage in timber quite a bit, never had a cripple, but I eventually just stayed with Sierra 180 RN.(match grade accuracy) I was always fond of neck shots (a campfire no-no) and it seemed the Sierra gave more dramatic expansion at Krag impact velocities at 100 yds more or less. The impact velocity at an estimated 1,450 fps worked well, even though Sierra's own quote was that they worked best above 2500. I fiddled with 170 Flat Nose one season...too much of a good thing...they expanded when dropped on the floor. This is all opinion, no scientific fact.
It's a good bet that they meant something along the lines of "These bullets work best at impact velocities experienced at typical hunting distances with the bullets having been launched above 2500 fps."
