Re: Barrel Lapping vs. Tubbs Final Finish
Originally Posted by Gene
I tried lapping a Rem 700 factory bbl with JB compound, and it did nothing. Just finished with Tubbs Final Finish. I followed instructions, did the entire treatment and now it cleans nicely, very smooth and no bluing, but accuracy has not changed at all.
JB was never designed to take the place of lapping. Polishing yes, lapping no. It may be considered a 'lapping compound' but it is too fine to cut and remove imperfections and smooth out tooling marks. Note that there is a big difference between smoothing out rough metal and polishing a metal surface. Hence the reason it did not work for your purposes. If anything, too much JB (even a little is too much IMHO) actually makes copper fouling worse due to the bore being too polished.
Another FYI. I have talked with several barrel makers and they all have said that a barrel can be lapped after it has been chambered and crowned. Their tecnique is different thats all. The only issue with the crown is that the very sharp edge/finish of the crown gets damaged. Freshing up the crown by a few thousandths of an inch cures that. New barrels get fish mouthed at the end from lapping because they don't care about the end of a barrel that is over 27" long that is to be finished at 26". They just lap them without regard for the muzzle end. It would take too much time on the production line to take that much care of a new barrel.
Long range shooting is a process that ends with a result. Once you start to focus on the result (how bad your last shot was, how big the group is going to be, what your buck will score, what your match score is, what place you are in...) then you loose the capacity to focus on the process.