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Old April 15th, 2018, 09:44 PM #1
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Neck size for AR

Why canít you neck size for an AR if the brass is from that AR?
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Old April 15th, 2018, 09:50 PM #2
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Because the brass is still expanding when it's being extracted.

IN a bolt action the brass remains in the chamber long enough to transfer heat to the chamber walls and then contract slightly.
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Old April 15th, 2018, 10:34 PM #3
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An autoloader is not a bolt action rifle and needs a little more sizing to ensure reliable extraction, as Jaybeez said, you are often trying to extract a semi auto case before it has had a chance to fully 'relax' after firing. You will likely have extraction/sticking issues if you neck size only. Set the shoulder back a few thou and you eliminate this potential problem and still really don't work your brass much.
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Old April 16th, 2018, 07:20 AM #4
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No.

The reason is, the bolt action has more camming force to CHAMBER the round. So it does not have to slip into the chamber.

Semi autos do not have the force to chamber a round that is not small enough to pretty much drop in.
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Old April 16th, 2018, 07:46 AM #5
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I'm going to stick my 'neck' out and say this; If you are only shooting this ammo from one gun, after neck sizing, the brass passes the 'thunk' test in your case gauge, I say give it a try. If you run into problems feeding or ejecting, then I would abandon the idea. Remember, in a gas operated semi, ejection is solely reliant on that gas. Bolt guns work on arm power.
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Old April 16th, 2018, 08:35 AM #6
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You can adjust the sizing die so the neck is sized and the case shoulder is just ‘bumped’. The case should just drop into the chamber and full battery obtained. That adjustment would be for that rifle/pistol only. Feasible for shooting needing finite accuracy, but for other purposes just full length resize. I crank out sub moa on my Dillon without much effort.
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Old April 16th, 2018, 08:56 AM #7
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I'm going more with Pinecone than Sticky on this one for the reasoning, but the bottom line is the same .
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Old April 16th, 2018, 09:12 AM #8
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Old April 16th, 2018, 09:41 AM #9
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Could it not be both reasons?

OP...what's the concern about just full length sizing? Extending case life or trying to maximize accuracy?

I've found quality dies produce ammo just as concentric and accurate as neck sizing only dies. Forster and Redding Competition dies are fantastic.

If you're looking to work the brass less, you could always use a body die to bump the shoulder back and then neck size. Or anneal your brass to reduce the work hardening.
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Old April 16th, 2018, 09:54 AM #10
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Found this interesting and relevant:

Shoulder Bump − How Much Do You Really Need?
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