[Fido969]

I think you’re good to go, that looks like 7.62x52R to me, and the bullet isn’t supposed to fit into the barrel all the way, the extra diameter allows it to engage the rifling.

If you’re worried, tie the rifle to a tire, and set it off with a string. Inspect the case, bolt and breech for pressure signs.

[Fido969]

sorry - 54R

[humblegunner]

If you’re worried, tie the rifle to a tire, and set it off with a string.

I was thinking of a very similar test.