Luger ID .30 cal or 9mm

[Josafoot]

Originally Posted by Chickenthief

And the one pic that could determine it is missing ;-)
The muzzle!

Take the dummy and see if the front part of it will fit the muzzle.
If it is indeed 7,65/.30 only the tip will enter, if it is 9mm most/all of the front part will enter.
The 9mm has a stepped chamber and the dummy might be binding in that part so it looks like it is a 7,65/.30 chamber.

That or use a dial caliber. The difference between .308 and .355 is obvious.

I can get a picture of the Muzzle.

I tried putting a .303 British Dummy round in the front and it stopped at the bottom of the round towards the bottom of the casing. (I don't have a dummy 9mm).

I assume that the dial caliper would be the best way to do this and will check tonight.

The chamber does have a large step in it which perplexed the store owner (not the original owner, just my FFL). I was under the impression that the .30 cals did not have a step because the round has a bottleneck. Maybe it is the other way around?