Norc Headspace. Ammo or bolt?

BobberDave

BobberDave

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I have an older Norinco M 305 from about 2004. Thousands of reloaded rounds through it with no issue until last week when I noticed flattened primers. I'm suspecting excessive headspace but after doing a search here found info on Federal primers being too soft. Is this so? This weekend I'm going to try out some reloads with N0 34 primers and some surplus Norinco ammo and see if the primers are flattened. In any case I want to inspect the bolt before hand. What signs should I look for on the bolt head if there is excessive pressure?
 
Look for hard extraction and FTE. Flattened primers are not big an issue. The one M305 that i looked at was about 14 thou over go gauge and still shot just fine.

Over pressure and yet not so very bad as there are no bolt face impressions on the brass

IMG_20130330_193203_zps8658f33a.jpg
 
Last edited:
BobberDave said:
I have an older Norinco M 305 from about 2004. Thousands of reloaded rounds through it with no issue until last week when I noticed flattened primers. I'm suspecting excessive headspace but after doing a search here found info on Federal primers being too soft. Is this so? This weekend I'm going to try out some reloads with N0 34 primers and some surplus Norinco ammo and see if the primers are flattened. In any case I want to inspect the bolt before hand. What signs should I look for on the bolt head if there is excessive pressure?
Click to expand...

Curious about powder type and charge weight? And has anything changed such as switching to a new powder or Federal primers, or different manufacturer of the brass?
 
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