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Thanks everyone. I have started again with new cases.
As suggested Ive sized a fired case for a slightly firm bolt closure and then sized the new cases to that (the shell holder and bottom of the...

No I'm not. Thanks for the thought.

Lots of great replies here thanks. I’ve been away from home all week and back tomorrow. Then I will read the wisdom and decide what needs to be done.

Haven’t talked to him yet.

The Bartlein on this rifle was reamed by Mitch with a brand new standard spec reamer so I would be very surprised if the case problem has arisen from the 'smithing.

Thanks for this. The head space thing is mystery to me -loaded thousands of rounds and never had a problem until this rifle so never had to worry about it.

No

I "anneal" using my gas stove (single burner camping thing) and heat the neck holding the base of the case and twirling it. When I feel the heat in my fingers I dunk the case in water.

No. I pretty much just do the neck and some shoulder.

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Bases are good. No scribes or marks. I "think" it started after I annealed. Powder is Hybrid100V and R26. 162 grn at 3k out of 22" barrel so its up there. Have fired maybe 100 shots through the rifle...

Thank you for this.

Bruce

So I stuffed it annealing then?

I did anneal after one load. Maybe too hot?

What causes this? 7mmsaum. Full length resized. Warm but not hot load. 2nd and 3rd firing. Good Adg brass.
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