J E Custom
Well-Known Member
Two years ago, at the NRA Convention, I talked to the owner of a well known barrel company about fire lapping barrels with Tubbs bullets. His reply was, "we don't recommend anyone do this because we have no control over what they do but I fire lap all my personal barrels".
This will always be controversial, But the barrel makers that I deal with will void there warranty
if you do any abrasive cleaning or brake in.
I already knew the reason, but I had to ask how they could tell that It had been done. The answer was that fire lapping eroded the back part of the barrel (The throat and the first few inches) much more than the rest of the barrel. and it was evident when looked at with a bore scope and with test equipment. Shortening barrel life in the very areas that see the most ware. The use of abrasives to clean showed at both ends because it is very important that the person knows the proper way and doesn't use abrasives that are to aggressive.
When you buy a hand lapped barrel most will tell you which end to cut the chamber and indicate how much barrel needs to be removed at the muzzle. The barrel ends see the most ware because when first inserted the lap has new abrasive and it tends to cut more in the beginning.
I have fire lapped one barrel for a friend and used my bore scope from the beginning and could see the change in the throat and lead surface first.(This was a factory barrel that would not shoot better than a 5'' group at 100 yards so we had very little to lose. It did shoot better after the fire lapping
(2 to 2.5 inches at 100 yards) and being a hunting rifle I have no feel for barrel life at this point.
J E CUSTOM