OP
Well I'd shot factory jacketed soft point ammunition through it for years without a problem. Did need to remove the barrel shroud occasionally to clean the barrel, but nothing like what happened after I dug out some old, cast lead bullets and made some handloads.If you can't shoot lead bullets through a ported barrel, why would anyone want such a barrel?
The problem was made worse by the fact that these old lead bullets measure .431". I bought them for a mid-1980s Smith & Wesson with ginormous throats. The Dan Wesson barrel slugged at 0.428" and the cylinder throats at 0.4285", so the bullets were getting squeezed way too much.
I got a Lee resizing die for the old bullets but haven't tried it yet.
When all is said and done, porting a 2-piece barrel probably is a bad idea.