AR-10 resizing

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12 years 10 months ago #9880 by hondolane
AR-10 resizing was created by hondolane
I am preparing to load for my AR-10T. Due to the potential for slam fires on certain semi-auto rifles, I was always led to believe you should always full length resize. I recently was informed by another shooter that they regularly neck size after the first firing in their AR rifles. I would like to neck size for my AR-10T, but only if it were safe to do so. I have witnessed a slam fire on a M-14 and it was not pretty. Any input on this would be greatly appreciated.

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12 years 10 months ago #9900 by Akai
Replied by Akai on topic Re: AR-10 resizing
If fired in the same weapon I personally have just neck sized without a problem, now if the cartridge will be going into different rifles I would be inclined to full length resize the case. I'm not an expert here so let's here it from the reloading side!

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12 years 10 months ago #9905 by hondolane
Replied by hondolane on topic Re: AR-10 resizing
I normally reload for specific rifles when I am looking for maximum accuracy. In the case of my AR10T Iwillwork from a group of dedicated brass for this upper. Slam fires are my main concern. I do not have a problem full length resizing, but I am looking for maximum accuracy.

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12 years 10 months ago #9907 by Akai
Replied by Akai on topic Re: AR-10 resizing
Once again, form fired from the same rifle neck sizing should give you what you need, in my expeience it dosen't get any better!

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12 years 10 months ago #9918 by Bob Downey
Replied by Bob Downey on topic Re: AR-10 resizing
You might find a lot of your spent brass will have some monster sized dings and dents when you shoot an AR-10.
The ejector throws the brass pretty hard and it strikes the brass deflector.

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12 years 10 months ago #9921 by Akai
Replied by Akai on topic Re: AR-10 resizing
Good point Bob, guess I was thinking of using a brass catcher, but still a very valid point. Not the expert here and was relating to experiance on my bolt rifles and not with the AR platform.

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12 years 10 months ago #9938 by Bob Downey
Replied by Bob Downey on topic Re: AR-10 resizing
I must confess I have never owned a bolt action.
I certainly never carried one while in service.
Never even had any in the Armory.
All autos and Semi-auto M-14s and heavier weapons.
M-14s have a thing about bending the base of the cartridge.
Never really studied the cause.
Probably has something to do with how the bolt travel path during extraction.

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12 years 10 months ago - 12 years 10 months ago #10005 by zfk55
Replied by zfk55 on topic Re: AR-10 resizing
Akai, so I understand correctly... you neck size only, load a magazine and never have a feeding problem. Is that right?
Have you ever ejected an unfired cartridge and examined the shoulder of the case? One out of 5 of my AR10s will allow neck sizing only. All of the others allow the brass to hit the breech end of the chamber while feeding and put eithr a small dent in the brass or show definite abrasion marks.
When that brass is fully expanded (to the saize of the chamber) after firing and upon ejection, it makes for an extremely tight fit next load around if it's not FLS.

*Forgot to mention...... A slam-fire in an AR10 is not at all usual. If you're reloading just pay particular attention to the seat depth of your primers. A proud seated primer is a problem waiting for the right circumstance to appear.
Last edit: 12 years 10 months ago by zfk55.

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12 years 10 months ago #10009 by Akai
Replied by Akai on topic Re: AR-10 resizing
zk55, No, I'm not a expert yet on the AR-10 reloading side, I havn't reloaded many as I'm still stocking up on brass, jumped the gun and was speaking more from the bolt side, Bob caught me on that one! I'll agree that with this platform, more then likley you should full length resize. Mine as 1 of your's will alow for neck sizing, at least the first time ( I also have picked and chosen wich cartridges to reload) after that FLR, as I to have got some dent's here and their. So, I guess if having problems or in question, you should FLR for great accuracy! Glad to have your input! Guess I must be doing something right on primer seating as I havn't had any slam fires.

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12 years 10 months ago - 12 years 10 months ago #10011 by zfk55
Replied by zfk55 on topic Re: AR-10 resizing
The best possible brass you can use in your AR10 (Lapua included) is Lake City LR. It must be stamped LR. Its brass used by the USMC and Army long range shooters, aka. Snipers. We have some 2,000 of them now, all stamped '04. Weight variation is within 3 grains. Hard to beat that.
Looks like this.

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And this is what we use for case separation. Made it on our CNC.

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Last edit: 12 years 10 months ago by zfk55.

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