Earlier I posted about (and people helped me with) some rounds that weren't chambering in my 9mm Walther PPQ M2. (I was able to get rounds to work when I seated the bullet deeper.) Today I received a 9mm case gauge.
The rounds that are not successfully plunking in the PPQ barrel are passing the case gauge test. After doing some searching of previous threads on THR I'm concluding this is not an unheard of situation: Rounds that do fit in a case gauge sometimes do not fit in a particular barrel. (BTW - a sized shell - sans bullet - fits in the barrel just fine.
What I don't understand is how/why this happens. Doesn't this tell me - at least in theory - that I could buy commercially made ammo that wouldn't fit the PPQ? (I know there are situations where certain guns like certain ammo. But I've always taken that to be from a power/cycling-the-action perspective - not actual fit in the chamber. I don't think I've EVER had a situation where commercial ammo I bought didn't fit in a gun I had. Yet this situation - where a round would successfully plunk in a case gauge but not fit in a particular gun - tells me that commercial ammo might not fit some guns.)
What am I not understanding here? I would think the spec is the spec. And if the case gauge matches the spec - then gun manufacturers' guns should accommodate within the spec. I know different bullets can have different profiles, etc. etc. But the bottom line is this: It passes the case gauge plunk test but fails the PPQ plunk test.
Any enlightenment I would gladly take.
Thanks.
OR
The rounds that are not successfully plunking in the PPQ barrel are passing the case gauge test. After doing some searching of previous threads on THR I'm concluding this is not an unheard of situation: Rounds that do fit in a case gauge sometimes do not fit in a particular barrel. (BTW - a sized shell - sans bullet - fits in the barrel just fine.
What I don't understand is how/why this happens. Doesn't this tell me - at least in theory - that I could buy commercially made ammo that wouldn't fit the PPQ? (I know there are situations where certain guns like certain ammo. But I've always taken that to be from a power/cycling-the-action perspective - not actual fit in the chamber. I don't think I've EVER had a situation where commercial ammo I bought didn't fit in a gun I had. Yet this situation - where a round would successfully plunk in a case gauge but not fit in a particular gun - tells me that commercial ammo might not fit some guns.)
What am I not understanding here? I would think the spec is the spec. And if the case gauge matches the spec - then gun manufacturers' guns should accommodate within the spec. I know different bullets can have different profiles, etc. etc. But the bottom line is this: It passes the case gauge plunk test but fails the PPQ plunk test.
Any enlightenment I would gladly take.
Thanks.
OR