Its my understanding that a subsonic 300- B-O will not expand in tissue with a "conventional" type bullet- say, something like a Rem Core-Lock or a Win power point. Yes, I am aware of Lehigh and some of the other gee-whiz bullets, but that's not the point. So, for example, the Hornady black with 208 grain a-max travels at a nominal MV of 1020 FPS, but that speed isn't sufficient to expand with a projectile as described above. BUT- a Hornady 200 grain XTP 45 ACP travelling at a MV of 900 FPS will expand and perform with total awesomeness- like so many other 45 ACP HP rounds, from so many other manufacturers. So why can't this happen with a 300 B-O, without going to some gee-whiz round like the Lehigh?