Every bullet type has some different characteristics in different calibers. Aframes in 45 cal are much tougher than in 44 cal for example. I think the 300gr 44 mag bullet is vastly superior to the 300?s in 45 cal. I think it was you, franchise, that was commenting that jd jones or some gun builder had tested the 400 hr xtp 475 bullet and found it started to reliably expand at around 1600fps which mirrors what ive seen and that is the 475 cal xtps are tough tough bullets and dont reliably expand at 480 and 475 linebaugh velocities. It may and it may not. Ibe had the exact opposite with 240xtp mag at 454 velocities. Some great mushrooms and great explosions. Ots an interesting science experiment for sure.