Reloads not chambering

[AndyRealtree]

So my BIL and I cranked out some rounds today outta the ARs.. Went thru a few different recipes I've worked up in the last few months. I had a few that wouldn't chamber all the way out of the magazine, but would do just fine loaded one at a time not from a magazine. What would cause that?

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[Tx_Punisher]

Check the oal. Did you trim EVERY case and check fired length on all cases? What bullet? Sst's don't always feed well for me in my 6.8

[adam_p]

Could need the shoulder bumped back a little more. The extra drag from being in the magazine might be slowing the bolt carrier down just enough to keep it from slamming it home. I run all my semi auto loads through a case gauge.

[Artos]

You MUST FL RESIZE for the AR...seat to the mag. If you are doing this, then there may be a problem with the FL die.

[AndyRealtree]

Every case gets a FL resize, trim, and is measured individually for case OAL as well as loaded OAL. When I loaded them individually, there were no issues at all with chambering, firing, or extracting. Just weird to me that a few got hung up and wouldn't go all the way into battery from the magazine

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[AndyRealtree]

The ones that didn't chamber fully were kinda jammed in there too. When I pulled the charging handle back, I had to yank it back pretty hard. Would that be an issue with the die? Why would most of them have no issues, but ~10% get stuck like that? No mixed headstamps, all once fired winchester brass

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[Tx_Punisher]

Something in the resizing step. Less lube than others perhaps?

[TacticalCowboy]

Put a quarter turn into your sizing die

[AndyRealtree]

Something in the resizing step. Less lube than others perhaps?

Maybe.. I toned it down a little after I had a few dented necks, but I wouldn't think that'd matter as long as it sized the whole thing would it?

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[AndyRealtree]

Put a quarter turn into your sizing die

Tighten it up another 1/4 turn?

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[TacticalCowboy]

Yep. It sounds to me like the shoulder is a little too far forward.

[AndyRealtree]

Yep. It sounds to me like the shoulder is a little too far forward.

So you think if I tighten it up just a little bit more, it should take care of them sticking like that? I haven't ever had any issues with my AR reloads until this weekend. I'm still pretty new to loading for it tho, so I knew I'd have some kinks to work out

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[Gummi Bear]

I run a small base die set (http://www.rcbs.com/Products/Dies-by...AR-Series.aspx) to keep this very thing from happening. The Lee set that I had previously would cause the same thing you describe to happen. No issues since.

[AndyRealtree]

I run a small base die set (http://www.rcbs.com/Products/Dies-by...AR-Series.aspx) to keep this very thing from happening. The Lee set that I had previously would cause the same thing you describe to happen. No issues since.

No issues running these in a single stage? Think that'll fix me up if not. Thanks

Edit: I'm pretty sure this is what I've got.. I'll have to double check when I get home, and if it's not I'll be ordering a set of these

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[M6A2REPR]

Is your full length sizer a small base die? The problem you are having sounds like you are not.