Semi-auto Bren piercing primers - any solutions?

[browningautorifle]

WWII Brit through it, and some PPU next week,

Those should work fine if the WW2 ammo fires when it should. CCI makes military thickness primers I think...but I expect you just want to shoot factory. As for hurting a Bren, I loaded an old reload into an Inglis 8mm once...another man's gun and his cheap ammo gatherings...and when it detonated the mag turned into a tube launching the base and spring. The case was destroyed, the gun was unhurt. Functioned well as if nothing happened. Peter L will be able to give us some sage advise here if he sees this post.