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Rechambering a .308 Win barrel to .300 Win Mag.

5pins

Private
Minuteman
Dec 9, 2006
79
45
Charles Town, WV
Anyone cut a .300 Win Mag chamber into an existing .308 Win chamber? I have a new Shilen short chambered barrel, but I need a .300 Win Mag barrel. I don’t see any reason it can’t be done, but I have never done it before.
 
Make sure your 308 barrel has a twist rate you can live with when throwing heavy/long bullets.

./
It's a 1 in 10. Right now I'm using a 1 in 9, and it shoots the 220gr Sierra MK very well, but I can go lighter if need be.

Going to need to verify contour is safe.
I think it's the standard varmint, so it should be fine.

I also have a used, about 20 round, Shilen chambered in .308 Win with a 1 in 8 twist, but it's a straight contour.
 
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