I have made the primer fall out, and thus wreck the rifle brass, hundreds of times.
I have also made the case side guppie belly bulge on semi auto pistol brass, hundreds of times.
I have noticed a hierarchy in brass strength with respect to distance from the extractor groove to the primer pocket.
10mm, 25acp, 5.7x28mm.... very weak ~~50kpsi
40sw, 380. 9mm, 45acp.... weak ~~60kpsi
22-250, 243, 7x57, 30-06 Mauser case heads with large primer.... strong ~~72kpsi
7mmRM, 300WM, 338WM belted magnum.... stronger. ~~78 kpsi
223......very strong ~~82 kpsi
6mmBR, Mauser case head with small primer.... too strong for primer pocket to fail before primer pierces in work up. ~~88 kpsi
To get around this rimless case weak spot, 20 years ago both Casull and Ketchum were independently developing steel case head attached to brass bodies.
My idea, if possible, would be to make a more powerful small rifle magnum primer that could set off a large charge. CCI450 small rifle magnum primers will set off 40 gr of CFE, but not 42 gr.
Then with small rifle primer pockets, we could get more out of the same old brass:
https://www.makeitfrom.com/material-properties/Extra-Hard-H06-C26000-Brass
