28 Nos Flattened Primers

[Woolsocks]

For some reasons my 28Nos always seems to flatten primers. Load on the low end, or at the top, doesn’t matter. No other pressure sign, just pancaked primers.

Worndering if this is just a thing with 28Nos? They are a pretty high-pressure cartridge.

Using Peterson Brass, 175 berger elite hunters, WLRM primers, Retumbo. Loads range from 75gr at 2920fps to 79gr at 3080fps. All primers flat.

 

[Kickin45]

Excessive headspace?

 

[Woolsocks]

Excessive headspace?

I don’t think so. Two pieces of tape on the back of the brass = no bolt close.

 

[Darryle]

What action is the build on?

 

[Woolsocks]

It’s a fierce fury.

 

[Kickin45]

Tight bore barrel?
Try bringing your load waaaay down and see where the pressure begins.

 

[Woolsocks]

Here’s a photo of some examples. Left to right: unfired, 77gr, 78.5gr, 79gr.

Are Winchester primers soft? I usually use CCI’s.

 

[Woolsocks]

Tight bore barrel?
Try bringing your load waaaay down and see where the pressure begins.

I think I’m trying to figure out if it’s a pressure sign at all, given the absence of any other pressure signs.

 

[Kickin45]

Wow. That unfired case looks like you have the primer seated waaay too deep

 

[Broncovan]

Heh, that ain't flat.
When you punch the primer out and it looks like the head of a nail, then that's flat.
From what I've seen from a couple of my buddies 28 noslers, primers are kinda flat with no other pressure signs.
No catering, no heavy bolt lift, no ejector marks. You're good to go.

 

[Woolsocks]

Wow. That unified case looks like you have the primer seated waaay too deep

Yeah, I picked a bad example. My priming tool broke on that particular load day and I had to seat using the press. Here’s what most of my loads look like, now that my priming tool is back in order.

 

[Woolsocks]

Heh, that ain't flat.
When you punch the primer out and it looks like the head of a nail, then that's flat.
From what I've seen from a couple of my buddies 28 noslers, primers are kinda flat with no other pressure signs.
No catering, no heavy bolt lift, no ejector marks. You're good to go.

Ah. That’s what I was wondering. It’s a bit flatter than my other rifles, but I do t have any other magnum-types.