In the video after he puts the piece of paper in the primer hole and the hot glue, he says he puts the 7.62X39 shell into a "press". Could someone explain to me what kind of "press" is he using? I have a 14.5" A.A. 6.5 Grendel upper and a bunch of 7.62X39 brass. That would be handy if I could learn that trick. Thank you for the video post.
What is the punch doing? Plugging the case mouth and displacing the water?
The punch is a slip fit, allowing little to no water to escape the case. Water is nearly incompressible, so by smacking the punch with the hammer, the water pressure forces the case into the shape needed to use the resizing die to finish forming the case. No water gets displaced, else it wouldn't work. Containing the water in the case is key to hydro-forming the brass.
I have a daughter. I tell her, "911 is what you dial after you're raped. 1911 is what you should have before they try."
Very Interesting. Thanks. No need to fire form!
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