7.65 parabellum

unspellable ;

I would give some heavy thought to firing anything that measured even .001" greater than the groove diameter.

Remember that the bullet is being swaged by the rifling and any oversize will just increase chamber pressures more.

And this higher pressure will not necessarly result in more recoil or velocity, being somewhat absorbed by the internal friction of deformation of the slug.

I would say no to any thing larger than the rifling bore size by more than .0003"

IMO, For what its worth.

ViggoG