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I read the .338/50 was a 3,000 yd match rifle but didnt see how it could be a match rifle shooting a big a$$ bullet at such high velocities and creating so much recoil.

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I just made myself a find that Im going to work on having one of my own. The 6mm Swift Its quoted to be the ideal cure for a shot out .220 barrel. Also would like to learn some about the .270-308 cartridge. Could a person take a .243 or .260 case and neck it up to .277 and have the barrel bored to .277? Seems like you could but would there be enough barrel left to handle the pressure?

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I would not want to pull the trigger on a 6mm anything shooting into a .224 barrel. That sounds like a recipe for getting a bolt handle lodged in your head. "Shot out" typically means that the throat has eroded in a barrel. The bore is still the same diameter. It could also refer to a barrel that has excess copper buildup due to inadequate cleaning.

Re-boring a barrel is not done much these days. It's too expensive to be worth the trouble. If you simply want a unique cartridge, buy a used .270 Win or .270WSM factory barrel and have it rechambered.