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Old April 19, 2012, 01:20 PM   #1
hhunter318
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Join Date: September 15, 2010
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Prefit Barrel Question

I might have beat this to death, but I've decided on the 7x57 Ackley Improved. I know I'm going to get asked why go with an AI, but the answer is just because, and they're a little more unique. My question is can you take a barrel prefit to 7mm-08 and run the 7x57 Ackley Improved finish reamer in to headspace correctly to make this work? I know you'd have to set the barrel back to correctly chamber it if its already chambered to 7x57, or am I wrong?

Thanks for any responses.

hhunter318
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Old April 19, 2012, 11:44 PM   #2
James K
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A 7mm AI reamer should clean up either a 7mm-08 or a 7x57 chamber.

It should not be necessary to set back a 7x57 barrel unless the headspace is already excessive.

Jim
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Old April 20, 2012, 02:35 PM   #3
hhunter318
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Thanks for the info. When I was told the barrel would have to be set back for the 7x57 to 7x57AI, I couldn't understand why since only the shoulder angle and body taper are changed and not the length of the neck. Again, thanks for the answer.
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Old April 21, 2012, 07:58 PM   #4
James K
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The whole idea of the AI cartridges, per Ackley himself, was to allow a standard chamber (7x57 in this case) to be reamed out and the standard cases fire-formed to create the AI brass. No barrel setback required.

Jim
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