Dwayne, Yep, thats my experience as well...on a Colt SAA to which I fitted a .45 ACP cylinder. The short shell actually shot better groups than the .45 Colt that it was born with. You'd figgur that long leap from case, through the cylinder, past the forcing cone then into the rifling would be the death knell for that stubby bullet, but not so...and especially with that Truncated cone, LSWC...a real tack driver. Come to think of it, I've never slugged the throats on the .45 Colt cylinder, just assumed that Colt had it right...but really, it's good with that longer shell as well, doing around two inches at 25 yds for me...with that hog-wallow rear sight notch and a blindingly bright front sight, that's about my limits. Gotta have the sun behind me to do good work with any short gun but especially with those less than idea sights.
But a thought comes to mind...My 1955 Target Smith in .45 ACP is a tack driver, and in spite of that extra long leap to the rifling, so maybe I'm making more of it than is justified.
Be interested in how your cylinders slug for you...let us know...and the accuracy it's capable of too!
Rclark, master guru of all things .45 Coltish...I'd be interested in the load that works for you with that heavy bullet in .45 ACP brass....that's a pasture I've yet to till, and might be a good combo for an ancient S&W 1955 Target of mine...in .45 Auto-Rim...
Best Regards, Rod...here's a pic of the Smith...been with me since the spring of '88, a great shooter, but with that post front sight, not much of a carry gun...