Internal ring 380 brass

[Iron Sight]

Some collected 380 brass I have has an internal ring pressed into it not restricting insertion of a projectile. Almost canellure in appearance? Externally this ring cannot be seen. Its on different head stamps. Pic happens to be *I* stamp. Any Ideas. Wondering if this was done by the manufacturer or the purchaser?

 

[ReloaderFred]

It's made by Federal and Speer (probably on the same machines). It's to prevent bullet setback while cycling. A long bullet seated beyond the step will bulge the case. They've been making them that way for a few years now.

Hope this helps.

Fred

 

[Iron Sight]

Its not a step. It does not restrict movement of a projectile into the case. The ring is pressed into the inside of the case.

 

[ReloaderFred]

I know exactly what you're talking about, and I've got hundreds of those cases. It's a slight step that you can measure with a micrometer or caliper. According to the reps at the SHOT show that I talked to, it's to help prevent bullet setback. Wait until you run across one of the 9x19 cases from AmmoLoad. Now there's a pronounced step!

Hope this helps.

Fred

 

[243winxb]

9mm has it also

Lip to prevent bullet setback OR "

I believe the internal step is to simulate the internal volume of the tapered wall thicknesses that most 9mm casings have. Of the differnt headstamps I've measured, all of them have walls that are much thicker at the bottom. Most of them have a constant thickness from the mouth to about 0.25 deep, then start to taper. Hornady starts the taper at the case mouth. "

www.thehighroad.org/showthread.php?t=772561 From post #4

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[Iron Sight]

Thanks guys. I wasn't seeing what I thought I was seeing. 1st I over inserted a projectile and crushed/bulged a case as was described. Then I dug out a telescoping gage and it clearly indicated a smaller internal diameter of the case after the ring.

 

[gamestalker]

In my experience, this step / canelure is of no consequence following the first or second reloading or firing, it is simply ironed out by pressure.

GS

 

[rcmodel]

A cannulure in the case will be ironed out by firing.

These new inside stepped cases will not be ironed out because the case is actually much thicker behing the step.

rc

 

[joneb]

For 380 acp brass with the step I had to modify the expander plug to avoid the step.
Perhaps the step is there to PO reloaders, the ammo companies don't make as much money from us.

 

[rcmodel]

No.
The step is there to prevent bullet set-back, and blown- up pot metal .380's that don't feed right law-suits.

No cartridge manufacture gives a rats hind end about reloadability.

The only case manufacture in the world that does is probably Starline.
Cases for reloaders is all they make.

rc

 

[Zendude]

Is the ring located deep enough for different seating depths? Or is the seating depth pretty much the same for all bullets in a particular caliber? It would make sense if the seating depth was the same for all bullets of the same caliber, as that would keep the volume of the powder cavity the same. But i dont know if thats a standard or not.