Again, a throating reamer would fix that by elongating the throat but leaving the rest of the chamber alone, if properly used. Page 6, here
. A carefully used chamber reamer with the configuration you desire will work, too. Doing either will probably void the warranty, though.
In loading .45 Auto, the rule of thumb has always been that the front band of a bullet's bearing surface not stick out of the case by more than about 0.020 or so unless I know I have a chamber that's satisfactory for it. The thickness of a thumbnail is often cited. though that obviously varies with the individual hand.