Headspace too tight on PPU brass

[Magnum76]

Hello,

I apologize if this has been covered. I did several searches and came up empty. Here goes...

I swapped my mid-90's 112 from .223 over to .308. I set the headspace correctly with a Forster gauge. I only have PPU brass which I ran through a semi-auto. A Full Length Sized PPU case will not chamber.

For giggles I wanted to see how much headspace I would need to chamber the brass I have. I added two pieces of masking tape to the head of the GO gauge. I measured a huge .008" extra in tape. I set the headspace again and measured the GO gauge with tape and I compressed it to an extra .006. Now a FS PPU case would chamber just snug.

I have no intention of firing with this headspace setting.

My question is this: Does my PPU brass have too much "grow" in it from being fired from a semi-auto?

I'll get a piece of commercial brass today. I'm thinking that will be the litmus test.

Has anyone run into the above issue before?