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Can you buy turn key Rifle Barrels

Remington 700 300 win mag. It has less than 100 rds. The throat is very deep. I got it shooting 1/2 “ groups but rounds won’t fit the magazine.
Does anyone know a gunsmith in DFW area with reamer to recut a 300 win mag chamber.
 
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Best bet is to try a longer jump that fits in the mag, if you have a factory tube that shoots 1/2 MOA. My factory 300wm could not reach the lands and keeps 208 amax in the case. It shot great for almost 2k rounds with bullets seated so they could be mag fed. Jump was in the .2 range.
 
Touching lands ? Why ? Jump it 60 thou as a start and go from there.

Yes you have a half moa load which is long, I expect you can find a load which is shorter and fit mags.