norma factory ammo being over pressure

[jp 7saum]

hi everyone i just thought id mention this on here to see if anyone else has had the same problem, i bought some norma 76gr tipstrike factory ammo and it has been extremely overpressure, every case either has large cratering or the primers have been priced as you can see bellow, has anyone else experianced this?
im also now needing to find a new bullet and im probably going to lean towards hornady, has anyone got any recommendations?
thanks so much.
JP

 

[JTO]

Do those primers have np stamped on them?

 

[Smellydog]

They aint " overpressure" buddy, the primers are not flat or loose.

 

[HonestJohn]

New rifle to you or was it working fine before?

 

[webley701]

Primers can crater & ‘blank’ at normal pressures due to other circumstances.

As Smellydog has just written - the primers don’t indicate abnormally high pressures.

I’m wary of assessing pressure only by how flat primers look but none the less the shoulders of the primers are very rounded & seem well short of ‘over-pressure’.

Have you used this ammunition before in this rifle?

 

[Stumpy2]

Firing pin related?

 

[Will the chippy]

My guess would be a Remington or howa rifle with a slightly too long firing pin. They don’t look over pressure to me.

 

[jp 7saum]

It’s a custom 700, but I’ve nor had the holes in the primers happen before except for on my blaser with over pressure loads and I thought createring was a sign of high pressure but thanks for the feedback.

 

[jp 7saum]

Do those primers have np stamped on them?

They don’t

 

[jp 7saum]

New rifle to you or was it working fine before?

Never had this happen with other bullets before, this is my first time using factory ammo tho

 

[HonestJohn]

Never had this happen with other bullets before, this is my first time using factory ammo tho

But you’ve loaded and used the rifle before? Ie. It’s been safe and not done this previously?

 

[Will the chippy]

 

[JTO]

They don’t

Unless Norma have changed their ways, they might not be loaded by Norma. All Norma factory rounds used to have 'np' on the primers so that people could indentify reloads IE fakes.

 

[Cyres]

Soft primers?
D

 

[Smellydog]

A simple kind of test for standard rifle cases is to measure the brass above the extractor groove and write it down. Shoot the cartridge and measure the same case in the same spot.
If it hasn't grown by .0004" you are pretty good.

 

[jp 7saum]

But you’ve loaded and used the rifle before? Ie. It’s been safe and not done this previously?

Yep I’ve loaded for it with lapua brass and it’s never had any cratering or holes

 

[jp 7saum]

A land as there’s no danger with it it’s not a bother for me, can it cause harm to your rifle or is it just a simple case of just having a hole in the primer?

 

[Border]

Unless Norma have changed their ways, they might not be loaded by Norma. All Norma factory rounds used to have 'np' on the primers so that people could indentify reloads IE fakes.

Havent seen that for the last 20 yrs, here at least. Some are brass coloured some are Silver, most usually the latter. Factory loads.

 

[finnbear270]

Bit of a doughnut on the firing pin strike.

 

[Acm]

They look quite high pressure to me, alot of cratering on the primers that remain.