Does anyone in Canada do a USGI bolt swap on the Norc 305s?

[Malaph]

You don't have a headspace or primer issue. You have a load issue. You're 35 or 36 grains of H4895 is too far under the minimum load. It's unsafe as well. Below minimum loads can be as dangerous as above max loads. Causes weird pressures where the powder detonates instead of burning. Use the correct loads and do not load below minimum.
If you want a lighter load, use a 150 grain match bullet.
Headspace issues will have more than just flattened primers anyway. You having any extraction problems? Primers backing out? (That leftmost case's primer looks high though, but that may be due to not removing the crimp. High primers tend to cause slam fires too.) Stretched cases?
Headspace is only checked using headspace gauges. Bits of tape, etc tell you nothing.

I think you might be right. I tried a 168 gr A-max and the pressure signs went away at 37 grains, bullet was going around 2450 fps. My target is 2,500 fps, so I'll do the next step to get there later this week - but the primers stopped backing out at this level and when they don't back out they don't flatten, so you and the gentleman who said insufficiency pressure might be preventing the primer from being held in properly probably solved it. I will post pictures of the completed load's primers when done - thanks!

 

[Malaph]

Yup

If you want send me three cases fired with your gas system off and I can give you a head space measurement

My first kick at the cat

p.s. your primers are NOT flat

Wow those are flat haha

 

[Malaph]

Average load should be between 43-45 grains with 150 grain projectiles. I am suprised it still cycles in the mid 30s.

168 gr bullet


No extraction issues actually finally making some progress by "breaking on through to the other side" seems the pressure signs were indeed due to insufficient pressure

 

[Malaph]

Yomama I'm going to mic my fired gas system off cases shortly (with datum measure from Hornady gauge).. Will post measures - appreciate the offer though !

 

[Malaph]

Another hiccup last night is my scope broke on the m305 .. One of the lenses inside of the scope fell out .......... Anyone else love bushnell scopes ? Lol

 

[yomomma]

M14 are a little rough with the cheaper scopes...

My headspace was somewhere around 1.644.

After I lapped the new bolt in I am aroung 1.630. Modified my reloading dies so my reloads measure 1.627 or so...

 

[yomomma]

Oh and you can also get pierced primers with to much headspace.

 

[eaglesnester]

How light are yur light loads. Too little powder can detonate and produce dangerous pressures.

 

[allarile260]

I have a USGI bolt in my Norinco, it headspaced at 1.631 aka Match headspace. Check my thread on my rifle to see what it's shooting like. I'm so happy I had mine done. The man to do it is 45ACPKING, he built my rifle.
It shoots like a dream.
Riley.

 

[Malaph]

I have a USGI bolt in my Norinco, it headspaced at 1.631 aka Match headspace. Check my thread on my rifle to see what it's shooting like. I'm so happy I had mine done. The man to do it is 45ACPKING, he built my rifle.
It shoots like a dream.
Riley.

Thanks man, I'll fire him a message. I really want to do it and get a nice scope for that rifle, It's honestly my favourite shooter and I got it for like less than 400 bucks.