Ok, I have a question, I looked around and haven't seen it answered, so I will ask here. Don't flame, just give me a straight honest answer if you can, please.

I recently picked up some DAG blue training ammo, in 7.62 NATO. It was made by the Germans for the G3, and with the correct practice bolt will cycle one.
Otherwise, it's a single shot for a semi, and for bolt action, it may/may not eject great (the case rim is very slightly smaller than "real" .308 or 7.62 NATO. It's made this way because the G3 practice bolt face is slightly smaller and thus can't run/chamber regular ammo, which would be catastrophically bad if it were to).

This stuff is cheap, about the same price per rd as steel-cased 9mm. It appears to be accurate up to 100m, and definitely 25-50m.
It is all molded plastic, with a brass case facing where the primer is seated. The bullet is barely attached to the case, and detaches and runs free upon firing. I've seen several videos, it initially chrono's at over 4800 fps, slows down quick but that's how it stays relatively point of aim. It seems to bounce off ballistic jello.

Ok- I have among other rifles, an Ishapore 2A1. That's an Indian-made SMLE in 7.62 NATO, they used to make the Enfields prior and it's British factories. They couldn't make enough FALs fast enough, so they made those bolt guns for the reserves. I've shot it, and it's great. It's basically a MK III in 7.62 NATO.
That's going to be my primary usage for this stuff, it may or may not eject but for that price I will have fun.

Now, the question- I've got some other surplus bolt action rifles, different 30 calibers, I know not interchangeable. But that's not compatible with full-loaded brass-cased ammo. What about this plastic stuff shooting a 12 gr plastic bullet? I'm wondering about 7.5x53.5 Swiss, or 8x50R Austrian... if the bolt closes, would there be any danger to fire?