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My understanding is that (Starline) makes 3 different Case designs (weights) in the basic 45 acp platform.
45 acp
45 acp+P
45 Super (Same Case Length as 45acp, the same basic brass as 45 Win Magnum)
460 Rolland (Longer Case Length than 45 acp, the same basic brass as 45 Win Magnum)
45 Winchester Magnum
The heavier made brass in the web area is to help prevent Bulging/Blown Out Cases in the web area. I would recommend going with 45 Super Brass if I were winding the loads up past +P, with a standard 45acp chamber. I would also make sure not to mix the ammo so loaded up where it could get into a non-modified semi auto.
I have a 625 S&W that has been rechambered to 460 Rolland. I ONLY wind up loads past 45 acp +P in 460 Rolland Brass to keep it out of 45acp chambered guns not set up to take the added Pressure/Slide Velocity. I have no experiance with HOT (Past +P Loads) in a semi auto 45 acp. I also have a Colt 1911 that I do not intend to wreck with Past +P loads. Myself I will keep my Hot Loads in Rolland Brass.
Bob
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