Gunsmithing Can you re ream barrels after being used up?

Sure, if you want to pay the setup fee and labor to drill it and rifle it to the new caliber for a lot size of one......

Barrels are consumables: they go in the trash when they are done.
 
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That is typically only done under special circumstances for historical or heirloom conditions.

Repeated 50-60kpsi fire cycling changes the metallurgical characteristics and structure. The characteristics that the barrel was originally designed and manufactured to meet are no longer in that range. Like said above it's a consumable.

I had a old 16" 308 barrel that had probably 3000 rounds down the barrel, I was going to drill out to 1/2" for non gun related project. The throat area was like unobtanium, I just about ruined a carbide insert drill getting through it.
 
Re-lining barrels was common back in the day. Drill/ream the barrel, and insert a liner. Brownells still sells the liners I think. Those old guns suffered more from corrosion and pitting than actually wearing out the throat as we know today. I know some black powder competitors that went 20000+ rounds. A lifetimes worth of use for an average joe in those rifles (BPCR). There is a guy in Texas, who’s name escapes me, who does what the op is asking. Not that common for sure. What missed is saying about hard throats seems right, if not only for the material, but the carbon buildup, which is super hard.

OP, ask yourself honestly how much you’ll shoot. Do the 6 creed and enjoy it. If the barrel life gives you that much pause, do the 6.5. There’s a click or two of difference between them. Nothing lost either way imo.

 
Of course you can. It's called reboring. Contact JES reboring, excellent work, 2 week turnaround and <$250. Just got back a No. 1 that went from 30-06 to 9.3x62. Rebored are often better than new as barrel steel has "seasoned" for lack of a better word.
 
Rebored are often better than new as barrel steel has "seasoned" for lack of a better word.

Where do people come up with nonsense like this? I should tell purchasing at work to start buying junk barrels so we can machine them into the precision shafts we make for our electric motor components. Because "seasoning"

LOL
 
Look into "setting back" a barrel. Cutting off some, rethread and rechamber. I had that done to my .260 and have more rounds down the pipe that some "experts" say I should be able to get. There is NO metallurgical change in the base metal in a bolt gun barrel, no seasoning, no change in metallurgy.