Originally Posted by Loner
To Add, most barrels (if not all) are not straight, the curve is usually indexed up by
the gun builder. You want that to remain the same if possible. I have had barrels not
turned a full turn because of other constraints and everything was fine, but that is not always the case.
The case for custom barrels. I just can't see putting money for rechambering into a production barrel, I just wouldn't be satisfied. As far as the caliber designation, I think I would rather have none at all verses the wrong
one on there. Picture this! The 7mm Rem. Mag. will chamber in the 7mmSTW, and fire! I don't want to be the shooter or the guy that did the work in that case. If there's no caliber designation at least it says (to me, anyway) that 'something' has been altered, investigate before firing (all
barrels should have the proper
caliber designation imprinted or engraved on them).
I measured a barrel tenon on a Howa 'take-off' barrel, 1.018" dia. , which translates to 25.85mm (a strange number) x 1.5mm. (most likely 26 X 1.5mm).The barrel would advance .0591" per complete turn. The STW really needs a 26" barrel and most factory built 7mm Rem. Mag.'s have 24"barrels. As for the headspace being the same, yes, it is. In theory it sounds good to just "run that STW reamer in until the part that cuts the belt starts to cut. Unfortunately, in practice, you have gone too far by then and the bolt will close on the 'NO-GO' gage and you will be setting the barrel back to correct for proper headspace. If you did stop cutting in time, would the old chamber be completely removed by the STW reamer. Maybe, maybe not. I can't see a manufacture taking the time to install a barrel to its 'curve'. Time and skill cost money, and they need to sell as many rifles as they can for as much profit as they can (they are publicly traded companies). I think they are more interested in profit and liability than quality these days.( my JGS chamber prints show both the 7mm STW and the 7mm Rem. Mag. to be the same diameter, .513", just ahead of the belt)