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.223 A I Sticking Cases

 
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  #1  
Old 10-25-2011, 09:36 AM
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Join Date: Oct 2011
Location: San Diego County CA
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.223 A I Sticking Cases

I have a Sako .223 converted to the A I configuration and I have a problem with cases failing to extract. In fact I am unable to open the bolt unless I give it a sharp rap with a wood block or soft mallet.
I tried a detailed cleaning of the chamber and bolt recesses and believe that all is clean. Next I pulled the striker from the bolt , added a coating of J B paste to a fired case and "worked" the case into the chamber about fifty strokes. The case took on a very fine "sanded" appearance over the front 1/3 and rear 1/3 with an un affected portion in the middle. I measured case diameter all along the length and it tapers smoothly ( as well as I can Mike it).Next I cleaned all, reassembled, applied a very light coat of oil to bolt and fired ten rounds. Two were hard to extract but yielded to a sharp palm stroke.
Before I go any further with this I would ask if any other LRH members have any clues or suggestions?
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  #2  
Old 10-25-2011, 11:48 AM
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Posts: 928
Re: .223 A I Sticking Cases

at what pressure are your loads running ?
case length?
new re chamber job?
is OAL correct for this rifle?
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  #3  
Old 10-26-2011, 09:44 PM
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Re: .223 A I Sticking Cases

I am shooting once fired cases which after fire forming have a length of 1.68" to 1.72".
I am loading Barnes VG 36 Gr. bullets in front of 26 Gr. of A2230.
I can't measure pressure but it should be at or below 50,000, based on 223 Rem data. Primers are not flattened and case heads are not expanded.
OAL is consistent with 223 Rem length, actually a bit shorter.

Thanks for your interest,

bob
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Old 10-26-2011, 09:50 PM
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Re: .223 A I Sticking Cases

I forgot to state that this is a new rechamber job.
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  #5  
Old 10-27-2011, 11:23 AM
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Re: .223 A I Sticking Cases

Quote:
Originally Posted by pennytoo View Post
I am shooting once fired cases which after fire forming have a length of 1.68" to 1.72".
I am loading Barnes VG 36 Gr. bullets in front of 26 Gr. of A2230.
I can't measure pressure but it should be at or below 50,000, based on 223 Rem data. Primers are not flattened and case heads are not expanded.
OAL is consistent with 223 Rem length, actually a bit shorter.

Thanks for your interest,

bob
I don't have the data for the newer lot of 2230, but 28 grains in a standard .223 case should be about 48K. Are there any marks on the case OD? If so you may need to polish the chamber walls with 400 grit black paper. When you run the case thru a full length die; how much is it sized down? Should be about .003" to .005"

The case shrinkage on fire forming is normal, but in your case seems a bit excessive, and makes me wonder is the chamber is a little oversized. I would think the case should shrink in the .035" to .040" range. You are getting about .040" to .080" of shrinkage!
gary
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  #6  
Old 10-27-2011, 05:33 PM
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Location: San Diego County CA
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Re: .223 A I Sticking Cases

Thanks, I am going to do some more work and measuring, and post info I obtain.
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  #7  
Old 10-27-2011, 06:15 PM
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Re: .223 A I Sticking Cases

can you post a picture of a fired case that may help us see if there are any problems with the chamber. You may want to get a hold of the guy that chambered it to have him give it a look also.
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