.223 chambering problem


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Old 02-11-2013, 10:41 PM   #1
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Default .223 chambering problem

Ok, I've been reloading for a long time and just ran into a problem. I have 2 new Rockriver AR-15 and made up some reloads for them. I went out to shoot and one chambered and fired a 30rnd mag. The other would not close the bolt on the same ammo. I had to pry it out. I took each reload and when dropped into the chamber would not go all the way in. I dropped the same reloads in my bolt action .223 and it fit like a glove. Some old Lake City mil surp chambered also.

Question, I full length resized all the cases and they were once fired Lake City. Headspace problem? Small base problem? Tight chamber problem? what?



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Old 02-11-2013, 10:51 PM   #2
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Tight chamber.

There is a "tolerance" in chambers. If that particular chamber was cut with a well worn chamber reamer, just before they replaced it, it could be just barely in tolerance.

If it were mine, I would contact RRA and ask if they would be willing to re-cut the chamber. (But don't tell them you reload)

The other alternative is a small base resizing die. That's the less expensive short term fix, but it may shorten brass life in your other rifles.



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Old 02-11-2013, 10:56 PM   #3
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Is the problem RRA chambered for the .223 Wylde?

5.56×45 NATO Chamber OAL: 2.550″
.223 SAAMI Chamber OAL: 2.410″
Wylde Chamber OAL: 2.445″

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Old 02-11-2013, 11:03 PM   #4
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regular .223/5.56 chamber with 55gr VMax OAL was 2.250" I really think it's either the base or the chamber.

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Old 02-12-2013, 02:05 AM   #5
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Bet it's the chamber.

Have you tried to fire factory ammo in the recalcitrant RRA?

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Old 02-12-2013, 12:30 PM   #6
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yes I have lots of mil surp Lake City and it fires no problem. I measured my reload against the mil surp and really get no conclusive numbers. I've got a new headspace gauge coming from Dillon that should let me know for sure. I'm also thinking get a bore mop, chuck it in a drill and Flitz the hell out of the chamber

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Old 02-14-2013, 04:35 AM   #7
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Quote:
Originally Posted by Dan308 View Post
yes I have lots of mil surp Lake City and it fires no problem. I measured my reload against the mil surp and really get no conclusive numbers. I've got a new headspace gauge coming from Dillon that should let me know for sure. I'm also thinking get a bore mop, chuck it in a drill and Flitz the hell out of the chamber
If you have a chrome lined chamber, don't polish it out.
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Old 02-16-2013, 05:24 PM   #8
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checked my reloads with a Dillon headspace gauge. I get a headspace of .005 and the case OAL is .008 longer. Both of these are not enough to cause a problem in my other guns just this one RockRiver AR. Any thoughts?



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