A .45 acp bullet is an underperforming .460 s&w. Same size bullet. I’m also guessing its a 450 bushmaster pushed to 2000+ feet per second. I was thinking of buying the ruger rifle in 450 bushmaster and then remembered, hey, i already have a 460 s&w magnum revolver with a 10 inch barrel. Plus a downsizer .45 lc to practice with. Apples oranges and pears.