Dusty Stevens
Shiner
Maybe more neck tension is your key for that day
Erik Cortina
- Thread starter rebs
- Start date
Super Glue!!
This has been an interesting thread for me. Learned a few things I had not thought about before. But I disagree with a comment posted about air pressure changes inside a cartridge due to altitude. This dosent happen. But the internal pressure, probably insignicant, will change due to ambient temperature.
And I can now answer a friend's question: He shot old factory 38 ammo, stored in a tropical humid environment, in his modern s&w airweight. The cylinder exploded on the first shot and luckily he was not injured. The copper and brass plus moisture must have chemically fused together which created a pressure spike on ignition in excess of the strength of the cylinder. Mystery solved!
And I can now answer a friend's question: He shot old factory 38 ammo, stored in a tropical humid environment, in his modern s&w airweight. The cylinder exploded on the first shot and luckily he was not injured. The copper and brass plus moisture must have chemically fused together which created a pressure spike on ignition in excess of the strength of the cylinder. Mystery solved!
dcali
Bullet Maker
The idea is that the pressure outside the case drops, and the air inside does not. I don't know how good the seal is, but if it doesn't leak, you could have a few psi difference at altitude, which could put a few ounces of force on the bullet. Not a huge deal, but not nothing.
Dusty Stevens
Shiner
I highly doubt there is that good of a seal. The air pressure/ density altitude inside the case is the same as the air outside. You should see the trouble watchmakers have to go thru to keep an atmospheric seal on a watch. An interference fit on a bullet and primer aint that good or they wouldnt have to seal military spec rounds
Go to Eriks many UTUBE.COM videos their free. Just caught on to that at the top left of the screen there is an icon for showing just new post only. It only displays post a few days old. eliminates commenting by mistake on an original post months or years old.
Some time ago I did the math for this exact scenario and the pressure increase was
negligible.
Air pressure affects tune but it pushing bullets out...well, that's just a lot different. I'd be pretty shocked if it has anything to do with a bullet moving in the case all by itself, too. Negligible is relative but I agree..atmosheric air pressure changes ain't moving bullets out of cases or pulling them back in when it drops. Isn't that the same thing? Was this Erik's idea or someone else?
That was quite the "hammer puller."
dcali
Bullet Maker
The pressure difference is a few psi. If that’s enough to move your bullets, you’re using very light neck tension and you better be handling them carefully.
tvaught
Gold $$ Contributor
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