Veral, I have a S&W Model 60 Pro in .357 Magnum. It has a 3" Barrel. I cant get the restriction lapped out and was wondering if you had any suggestions. I used the same procedure on a S&W 627 and it worked wonderfully. The 627 took 32 rounds to remove the restriction. I also lapped a Ruger Redhawk in 45 Colt and it too worked great. That one took 30 rounds to do the job. But this darn Model 60 is driving me nuts. I have put 200 rounds through it and it still has a restriction at the barrel threads. I am very concerned about ruining the barrel. I have been checking the restriction by passing a .346 pin gauge down the barrel and it hangs up every time at the barrel threads. Just to complete the info, I don't have access to a facility where I could cast my own bullets so I bought some .358 diameter cast bullets for the two 357's and .452 bullets for the Redhawk, all with a BHN of 12. As I said, this process worked great on the 627 and on the Redhawk. On the Model 60 a .445 pin gauge will slide completely through. A .446 gauge hangs up at the barrel threads and a .447 pin gauge will not fit in the muzzle. A .358 guage easily fits in each of the chambers but a .359 gauge wont go in. Any help would be much appreciated.
