Dished cartridge head

[mellors]

Hi all. 

Found this yesterday once fired cheddite reload. 

Any ideas what would have caused it. 

Never had one before i check every load regardless. 

[edenman]

Looks like it’s been over pressured.

[old'un]

tight primer when reloading?

[mellors]

8 minutes ago, old'un said:

tight primer when reloading?

That's what i initially thought but it had been loaded and when i resized and loaded it no way would it have crimped as the wad was too high. 

That's when i spotted it really strange it had taken the primer as usual I've never had one before and I've loaded thousands. 

[old'un]

something as obviously pushed the base in, doubt it was from the firing pin hitting the primer, so the two possibilities are, one something was stuck on the base when closing the gun or the primer or something as pushed it in during reloading.

if its a first in thousands as you say, I would not worry to much.

[enfieldspares]

I have had similar dished heads when sizing in a Redding Model 16 type sizer when I've forgotten to put the "cap" over the resizing rod. Or some other error when resizing using a ring type base sizing ring. 

[cash1]

A long shot.  Primer pressure leak?

[mellors]

On 18/08/2023 at 09:22, cash1 said:

A long shot.  Primer pressure leak?

One of those weird things that happen had non since. 

Another anomaly 20 gauge lbc ribbed 24 gram wads i get 3 or 4 out of every bag 1 mm longer real head scratcher until you know.