Gunner, as I understand it, the headstamped brass was to address the lack of support in a typical 1911 barrel. I also understand that the newer 1911s have better support, so the regular brass very well could be sufficient.
Where I heard use of standard brass was with guys who have aftermarket barrels that have much improved support, and the most often group I hear using ACP brass for Super (and beyond) are guys with Glock 21s, of course that is probably due to gleaning the info from a Glock-specific site.
My Ruger SR1911 appears to have good support as does my Gen-4 21 with a KKM barrel. My Super loads usually top out at 25 Kpsi so Im leaving a little on the table. If a 255 hardcast at 1050 to 1070 fps isn't enough, I figure I just need a bigger gun, anyway
I enjoy letting friends fire one of my Supers. Boom.....big grin...."I gotta get one of these!"
