Round doesnt sit flush

[ExtremeX]

9mm does headspace on the case mouth, but they are not straight wall.

We are talking about headspace and crimp... Lets not nit-pick...

9mm Luger case has a slight taper to it, but its still considered a straight wall case as opposed a rimed case like 357 Mag which headspaces off the case rim.

This is why you can heavy roll crimp a revolver case like this while not creating problems with headspace.

[357magnum]

We are talking about headspace and crimp... Lets not nit-pick...

9mm Luger case has a slight taper to it, but its still considered a straight wall case as opposed a rimed case like 357 Mag which headspaces off the case rim.

This is why you can heavy roll crimp a revolver case like this while not creating problems with headspace.

[pacrat]

It is a "Straight Walled Tapered" case. Yeah everybody wins.