Reply with quote #9
I agree with Alf. You'd be nuts to try, especially with a hammer forged barrel.
If it's only a factory barrel, just buy an E.R. Shaw or one of the cheap Shilens. Your cost will be similar and the results will be much better I'm sure.
Also, there are issues with making Stainless barrels too thin. Krieger for instance will not make a 30 cal barrel in anything less than a bull contour. I suspect they are ultra conservative, but their prudence is not withou sound basis of fact.
Reply with quote #10
I've had a couple done without problems. One was a Shilen and the other was an Obermeyer. I pinned them both with a Deltronic pin and could not put a pin in that was .0001 larger than before contouring. You would normally recontour a hunting type barrel and not a competition barrel. I wouldn't take a #7 down to a #1 and mine were done on a CNC contouring lathe with flood coolant.
Who would throw away a free Obermeyer barrel that was 32" long in a Palma taper, not me. I had it contoured to a #4 and I cut the chamber off and some off the muzzle and I will have a nice 30cal. barrel for a hunting rifle. It had about 300 rounds on it.
I don't think you can make a blanket statement that it shouldn't be done.
Reply with quote #11
I think if you re-contoured it with coolant on a contouring lathe as Butch suggested, it may be OK. If then an experienced hand re-lapped it for dimension and (secondary) finish, it would probably shoot just as well or better due to the lapping. You may have to cut 1/2-1" off the muzzle and you might want to set the barrel shoulder back a bit and re-chamber afterwards also. After all that time and effort, hell, just get a new barrel in the contour you want and have it chambered and fit.
Reply with quote #12
I've had Clay Spencer recontour several barrels for me. I have never experienced any of the horrors, that I hear about on this, and other, forums. Every one of the barrels, that he recontoured, shot just fine.