The basic rule is that the more a bullet tends to expand consistently to a certain shape, the more it penetrates at higher impact velocities. I've found this to be generally true of Barnes X's, Nosler Partitions and E-tips, Trophy Bondeds, North Forks, etc.
When a bullet tends to expand more widely at higher impact velocities, the less it will penetrate. This category would include Hornady Interbonds, Norma Oryxes, Speer DeepCurls, Remington Core-Lokt Ultras, Swift Sciroccos, Woodleigh Weldcores--and even, to a certain extent, Swift A-Frames, because the rear end also tends to expand at high impact velocities. Also inclused would be cup-and-core bullets
This BEST verbalizes my experiences and OBSERVATIONS per velocity/penetration. As John says 'general rules' can have exceptions BUT we must operate in general rules UNLESS we always pay premium prices.
THANKS J B & BobNH
