quote:

Originally posted by carpetman1:
you guys talk about hot pressureized gas escaping and then get leading. That has implications of speaking of melting and I say bs.

Hey if anyone would know about hot gas, you'd be the man!

Carpetman is Rocketman?????

PUMBA from the Lion King

Hey Scot, tell Molly to look at the bullet I have posted here. It's an Oldfeller Boxcar for the Steyr M95 8x56R. I fired it into my retrieving media. Notice the raise edge on the force side of the rifling. Now take in mind that is a raised edge larger then the bullet diameter. Ask yourself how could that happen if the bullet was in the bore, the edge shouldn't have been any larger then the walls of the bore would allow it. Here's what I think. The bullet is spinning going down the barrel. As it emerges from the muzzle that part might be more free to spin a little more and as the rest of the bullet is still in the bore the gas pressure is putting a steady force on it so this ridge or edge continues to be formed uni formally. Does anyone have a better explanation? Here's the bullet:

I would say that is exactly what is happening. But it takes a couple of things to make that happen, high enough muzzle pressure to still be deforming the alloy/bullet(ie slow powder) and an alloy that is malleable enough to leave that fin instead of just blowing it off, breaking off. What's CMAN think?

It was a stiff load of slow burning surplus powder and the alloy is 50/50. This shows the bullet has momentum like a flywheel even with it's out of the muzzle and as I mentioned not confined to the bore restraints it definitely appears to have turn a little bit more then the part of the bullet still in the bore.

Now try and recover one cast of straight linotype and fired with a charge of red dot, would guess no fins.