Lone Wolf had to do it for me on their 6" and stock length barrels in .45 ACP barrel for my G21. Of course, their chambers are known to be short to begin with. But it feeds pretty much anything now. Gave them a dummy round and they matched the chamber to the O.A.L.
My KKM barrel for my Gen 4 G20 doesn't like truncated cone slugs unless I seat a little deeper that usual. Learning the sweet spot with this barrel.
Both good, accurate barrels.