Headspace...

[ricohman]

Sounds like you have found out that such is not the case!

No kidding!
Each of my rifles has its own bag of brass.

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[Maxwell Smart]

No kidding!
Each of my rifles has its own bag of brass.

Pretty much the same for me too. I've got a couple that will use each other's brass quite happily, but no way for the rest.

They might headspace the same on the rim, but at the other end of the chamber they often are all different shapes