I completely agree with Reflex. 40k PSI is getting to be on the hard side for a 1911. Granted the 10mm is more in that range, but the wider 45 case hits the breech with more backthrust. It's not just case pressure, but where it gets directed ;^)

But I also think the 45 Super is a bit easier to reload, as many projectiles get tricky in the longer Rowland case. To fit the 1911 magazine, sometimes the OAL gets so short that the longer Rowland case mouth hits above the full caliber ogive taper. I have seen this with a couple of flavors of 230 fmj's.

I have not purchased Rowland brass for quite a long time, but 45Super from Starline has never been a problem for me.

I think anything that you can do to add weight and length to the 1911 slide and/or barrel will help. A longslide would make for a dandy platform. I may be disremembering, but isn't the V16 ported?

Craig