taxidermy2
Member
Why can’t you neck size for an AR if the brass is from that AR?
Neck size for an AR
- Thread starter taxidermy2
- Start date
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Spur
Active Member
No real reason I can state, but my gut feeling is that you will get failure to chamber problems or extract issues. I would suspect that the generous military barrel chambering might create enough small dimension differences to cause problems. A commercial quality barrel with a well polished chamber might make a difference. I have never had luck with neck sizing except with bolt guns with single load slow fire, and I small base resize for my ARs.
Nope.
ETA: I see you wanted a teason. My bad.
Bolt.action guns are different in that you can apply force as needed to close on a round.
An Ar15 relies on spring force to chamber.
The case is extracted under pressure which causes it to be deformed more.
ETA: I see you wanted a teason. My bad.
Bolt.action guns are different in that you can apply force as needed to close on a round.
An Ar15 relies on spring force to chamber.
The case is extracted under pressure which causes it to be deformed more.
Last edited:
iH8DemLibz
When All Else Fails.
An AR round has to freely enter the chamber.
Neck sizing only works for bolt guns because you can cam, squoze, the case into the chamber using the leverage of the bolt handle.
***DO NOT*** attempt to reload AR rounds by neck sizing only.
Neck sizing only works for bolt guns because you can cam, squoze, the case into the chamber using the leverage of the bolt handle.
***DO NOT*** attempt to reload AR rounds by neck sizing only.
Screwtop.243
Ouch...that thing kicks
Yeah, I use small base dies for my AR reloading and have always been pretty much operating under the premise that tolerances with the AR won't permit neck sizing. I also use a Wilson drop in gauge to check everything and have had Zero failures to feed/extract.
dist1646
Ultimate Member
For neck sizing to be effective, the case neck needs to be turned to consistent dimensions or you are just wasting time.
Reason being, if the case neck is thicker on one side than it is on the opposite side, you induce run out and the bullet enters the rifling offset to the centerline of the bore.
Cases without uniform neck dimension will have varying amounts of tension holding the bullet. This results in different chamber pressures and more velocity spread.
The AR platform is not like a bench rest rifle and does not have the tighter tolerances due to the necessity of the manner in which the rifle is designed to function.
As long as the case neck is turned and the proper tension to hold the bullet is there, as well as sizing the body of the case so that rounds will feed properly, neck sizing is an option. Question is, is all that extra work worth the end result? In my opinion, probably not.
Reason being, if the case neck is thicker on one side than it is on the opposite side, you induce run out and the bullet enters the rifling offset to the centerline of the bore.
Cases without uniform neck dimension will have varying amounts of tension holding the bullet. This results in different chamber pressures and more velocity spread.
The AR platform is not like a bench rest rifle and does not have the tighter tolerances due to the necessity of the manner in which the rifle is designed to function.
As long as the case neck is turned and the proper tension to hold the bullet is there, as well as sizing the body of the case so that rounds will feed properly, neck sizing is an option. Question is, is all that extra work worth the end result? In my opinion, probably not.
- Feb 4, 2013
- 28,175
The same applies to full length resizing.
And full length resizing die normally uses a sizing button to set the inside neck dimension for similar neck tension.
You are confusing neck sizing only with bushing sizing of the neck.
Bushing sizing uses a specific bushing to set the outside neck diameter, requiring a consistent neck thickness for the same inside diameter.
And full length resizing die normally uses a sizing button to set the inside neck dimension for similar neck tension.
You are confusing neck sizing only with bushing sizing of the neck.
Bushing sizing uses a specific bushing to set the outside neck diameter, requiring a consistent neck thickness for the same inside diameter.
dist1646
Ultimate Member
With inconsistent neck thickness, there is a tendency for the expander ball to , for want of a better word, drag the neck toward one side inducing run out.
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