Originally Posted by
contender1
A fine gentleman named Fermin Garza wrote an article on Firelapping. I have a copy somewhere in my stuff,,, but do a search, read what he has to say about it. He's one of those folks who has been there, done that, and knows what he's talking about.
You are correct in that firelapping is about cleaning up bore constriction at the threaded portion (usually.)
I'm curious as to your gun only having 5 lands/grooves. I may be the ignorant one here,,, but I'm not familiar with a brand that uses an odd number of lands & grooves. But,,, If your concern is thread constriction and you wish to firelap, I suggest you do the proper test to see if it's actually needed. Slugging the barrel isn't the way to do that.