- Joined
- Apr 12, 2013
- Messages
- 562
I may have outsmarted myself but I bet someone out there has tried this.
The 22-250 I built last year was my 3rd rifle barrel to fit, so I am still on the steep end of the learning curve. It has turned out to be a really fun rifle and I ahve spent a LOT of time tuning loads, getting to half MOA with a couple. BUT, I am starting to see significant lengthening of the loads to still touch the lands...throat erosion.
It is on a Rem 788 action, so a separate recoil lug design. Reading all the chatter about this being a short throat life cartridge and setting back/rechambering being popular in some circles, I thought I would try and machine the threads to allow one small setback. I cut a very small ledge for the recoil lug, just enough to center it and hold it in place as the barrel is torqued. The lug essentially covers the thread relief groove, if you can visualize that. Now I should be able to cut back one or two thread lengths by only adding length to ledge the lug slips over and cutting back and refacing the end of the barrel. Call it around 1/8" total deepening of the chamber. That should leave plenty of threads to simply screw the barrel back on after reaming the chamber the same amount.
Will that allow enough deepening of the chamber to clean up normal approx 1000 round throat erosion on a Medium Varmint profile Douglas SS barrel that has bever been shot to more than 'warm to the touch' heat???
The 22-250 I built last year was my 3rd rifle barrel to fit, so I am still on the steep end of the learning curve. It has turned out to be a really fun rifle and I ahve spent a LOT of time tuning loads, getting to half MOA with a couple. BUT, I am starting to see significant lengthening of the loads to still touch the lands...throat erosion.
It is on a Rem 788 action, so a separate recoil lug design. Reading all the chatter about this being a short throat life cartridge and setting back/rechambering being popular in some circles, I thought I would try and machine the threads to allow one small setback. I cut a very small ledge for the recoil lug, just enough to center it and hold it in place as the barrel is torqued. The lug essentially covers the thread relief groove, if you can visualize that. Now I should be able to cut back one or two thread lengths by only adding length to ledge the lug slips over and cutting back and refacing the end of the barrel. Call it around 1/8" total deepening of the chamber. That should leave plenty of threads to simply screw the barrel back on after reaming the chamber the same amount.
Will that allow enough deepening of the chamber to clean up normal approx 1000 round throat erosion on a Medium Varmint profile Douglas SS barrel that has bever been shot to more than 'warm to the touch' heat???