Here's a couple examples from Speer #11 manual. Ruger security six, .357 mag, 6" bbl 158 gr hp. 1200 to 1300 fps. T/C .357 max 14" bbl same bullet 1900 to 2100 fps. Not really fair to compare a revolver & its shorter BBL & pressure robbing cylinder gap to the T/C. I shoot the .357 max in T/C bbls 10", 14" & 23". All group 1" or so @ 100 yds (scoped) even w/ bores that look like they were lapped w/ a brick to somewhat hide the chatter marks :D The Speer 158 HP over H-4227 is devastating on deer in the 50 to 125 yd range. I've never shot one further than 125 yds w/ this cartridge. The 23" carbine will group .5 to .75 @ 100 yds. Sorry I don't have a more realistic comparison of velocity. But, judging by knock down power on IHMSA steel targets the Max is a whole lot more effective than the mag in T/C bbls. of equivalent length. Beware of the Max in revolvers. It has a nasty habit of gas cutting into back straps. Hope this helped some, Dale