CALLING ALL BULLET EXPERTS!!!!

[R Digger]

so I was at my favorite civil war site and came across this .45 round. From the research I have done, it's dated 1934 made by Frankford arsenal. But it has an extra crimp in the middle of the casing, can someone please explain what it is that I have? Btw, this one is a dud, I also have found fired casings and the actual led bullet as well

 

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[fyrffytr1]

Just googling "Frankford Arsenal 45 caliber bullet" images brought up many with the same extra groove. I would guess that it was just a part of their manufacturing process.

 

[TheCannonballGuy]

The purpose of the crimp at more-or-less the middle of the casing is to prevent the bullet from getting pushed too deep into the casing, either during manufacture of the cartridge or due to "rough handling" of ammo-boxes or a clip or magazine. It is often seen on cartridges for semi-automatic and automatic firearms.