Can I re cut a 260rem chamber to AI specs without setting my barrel back?

tackdriver10

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Joined
Nov 17, 2009
Messages
165
Its my understanding that you should set the barrel back at least one turn. And when it is rechambered to an Ackley, then smith should stop reaming .002 short of the headspace dimension. This way, you end up with a tight jam on the factory case, which makes for a better fireformed case.
 

ICANHITHIMMAN

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Joined
Jan 31, 2008
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4,382
Location
SOCIALIST CONTROLLED TERRITORY OF NEW YORK
Its my understanding that you should set the barrel back at least one turn. And when it is rechambered to an Ackley, then smith should stop reaming .002 short of the headspace dimension. This way, you end up with a tight jam on the factory case, which makes for a better fireformed case.

Oh the fire forming issue never hit me thats a great point thank you.
 

sambo3006

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Joined
Jul 30, 2004
Messages
1,370
Location
SW MO
Tackdriver10 is correct. I believe the reason for the AI chamber being a bit shorter resulting in the crush fit on the shoulder is so that the case head doesn't suffer stretching in the initial fire forming.
 

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