Revolver Crimp Creep
- Thread starter Phauxtoe
- Start date
gun_slinger_boy
.338 Win Mag
I know this is a bit knit picky and maybe even a little silly but if he wanted to be a bit more scientific and precise he should have measured the length of all the rounds that cycled without firing first and then measured them again after all cycles. Comparing to other rounds even from the same box will give different measurements for every single compared round.
Deplorable Me
.700 Nitro Express
An alternate solution might be to run factory-defensive ammo through a Lee Factory crimp and to re-try the experiment.
gun_slinger_boy
.338 Win Mag
I would say you would most likely be reloading your own ammo if you had the ability to crimp but most of those high quality self defense projectiles are unavailable to the public. So you are forced to buy the ammo. It kills me that I can't buy the critical defense projectiles because those are indeed very good and what I carry. I'd also like access to HST projectiles.
I was thinking the same thing!
RandallOfLegend
.40 S&W
I carried Hornady Critical Defense in 40 S&W for years. Everyone gets antsy with bullet setback. I tested 5 rounds, cycling them through the action by locking the action back, and loading the round from the magazine. None of the 5 rounds showed any setback in my Ruger SR40C after 20 loadings. So I am not surprised to see his positive results with that particular brand.
Good video, it highlights the "usual way" a revolver fails, ammo jumping the crimp and binding the action.
Good video, it highlights the "usual way" a revolver fails, ammo jumping the crimp and binding the action.
gun_slinger_boy
.338 Win Mag
I solved the setback problem all together in all semi autos. For any pistol that I carry I keep 2 magazines (or however many you carry) that always have self defense ammo in them. The ammo never gets molested. Then I keep however many magazines to practice with. Whenever I go to practice with one of the carry pistols I simply remove the chambered self defense round. Then after I'm done with the plinking ammo I simply take the ejected carry round and manually put it in the pipe and manually/slowly let the slide go down on it. With this method you will never get bullet set back on your self defense ammo and don't have to do any silly rotation or anything like that.
Eddie Gunks
.338 Win Mag
Buy ammo. Pull bullets. Problem solved.
gun_slinger_boy
.338 Win Mag
But then that defeats the purpose.
RandallOfLegend
.40 S&W
It should have no effect. Unless you're a 9mm shooter, where 40 S&W might as well be 500 S&W magnum to your recoil sensitive hands. /s
A big part of the crimp jump is how the round is held by the revolver cylinder. The moon clips hold the brass section securely, and the bullet is only held by neck tension(9mm) or roll crimp (38). Bullets are "loose" in a magazine, they can slide forwards and back within the magazine. The sliding motion of the bullet and brass together prevents the kinetic pull.
gun_slinger_boy
.338 Win Mag
Actually I did. I taper crimp my 357, same crimp as a 9mm.You didn't watch the video did you
Not seeing your point?
gun_slinger_boy
.338 Win Mag
You have a 9mm revolver?
The reason he mentions it, I assume, is the different types of crimp. What specifically would be different about a 9mm?
RandallOfLegend
.40 S&W
Why taper a 357? I usually do a medium-heavy roll crimp, but I reload with slow powders.
Longer brass life.
Can crimp non-cannelured bullets.
I do a modest taper, 9.0Gr. of Power Pistol under a 125Gr. lead or XTP.
gun_slinger_boy
.338 Win Mag
Some 9mm don't have any crimp at all.
Factory 9mm without crimp!?
That IS news to me...
You'd think, being mainly used in semi autos, they would ensure proper crimp.
gun_slinger_boy
.338 Win Mag
Factory 9mm without crimp!?
That IS news to me...
You'd think, being mainly used in semi autos, they would ensure proper crimp.
Yup. And some reloading data even tells you to use little to no crimp.
Not when I expand the necks, no way. If even to just remove the bell.
Factory non crimping is crazy.
I under crimped a batch of 40 one time. Complete setback on the feed ramp, causing a jam. No more.