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Hello to all,

Im new to rifle reloading and have a issue with some Lapua 6.5x55 hope some body can point me in the right direction.
Ive attached a picture of a Lapua 6.5x55 case, fired once and loaded with 42.5 grains Hodgdon H4350 powder and a Lapua 139 gr Scenar. Next to it is an unfired new case from the same batch cut open.
It looks as if its loaded to hot and blowing the primer pocket out but its well below the Max on Hodgdons web site. Primers are CCI- BR2
Rifle is Mauser MO3 extreme, there no head swipes or smears on the back of the cases?
Any suggestions would be greatly appreciated.
Primers still have rounded edges and are not protruding from the case after firing.

Kind regards
Walter

Welcome to the forum. Could this be as simple as the de-capping pin stem being set too long causing the case to deform like this when the primers are popped out?

EDIT - By this I mean the rounded end at the bottom of the de-capping stem that holds the pin itself is being pushed into the case above the flash hole causing the whole primer pocket base to deform.

Welcome to the forum.

Why not introduce yourself on the New Members forum?

Going back to your post, what prompted you to section the case after first firing?

ovenpaa wrote:Welcome to the forum. Could this be as simple as the de-capping pin stem being set too long causing the case to deform like this when the primers are popped out?

EDIT - By this I mean the rounded end at the bottom of the de-capping stem that holds the pin itself is being pushed into the case above the flash hole causing the whole primer pocket base to deform.

Hello Ovenpaa,

Thank you very much I think you have it. Looking at the shape of my de-capping pin it is an exact match.

Much appreciated

dromia wrote:Welcome to the forum.

Why not introduce yourself on the New Members forum?

Going back to your post, what prompted you to section the case after first firing?

Hello Dromia,

Thanks I will do, I think the issue is sorted looks as if the De-capping pin base pushing out the cup.
Thanks again to ovenpaa.

Many thanks
Walter

I agree that is what it looks like and probably is but I am still interested in what it was that prompted you to section the case.

dromia wrote:I agree that is what it looks like and probably is but I am still interested in what it was that prompted you to section the case.

Guessing the OP was having a job properly seating the new primers?

dromia wrote:I agree that is what it looks like and probably is but I am still interested in what it was that prompted you to section the case.

Hello Dromia,

The reason is after de-priming I noticed a bulge in the primer pocket so decided to have a good look to see what was going on. Quite hard to see in the picture, but it does not look square.

Regards
Walter

Wallis wrote:

dromia wrote:I agree that is what it looks like and probably is but I am still interested in what it was that prompted you to section the case.

Hello Dromia,

The reason is after de-priming I noticed a bulge in the primer pocket so decided to have a good look to see what was going on. Quite hard to see in the picture, but it does not look square.

Regards
Walter

It's not suposed to look square though,is it.

BRYAN3 wrote:

Wallis wrote:

dromia wrote:I agree that is what it looks like and probably is but I am still interested in what it was that prompted you to section the case.

Hello Dromia,

The reason is after de-priming I noticed a bulge in the primer pocket so decided to have a good look to see what was going on. Quite hard to see in the picture, but it does not look square.

Regards
Walter

It's not suposed to look square though,is it.

I know words can be confusing, Let me do a picture.