ruger lcr crimp jumping w/.357 reloads

[Illinois sucks]

my new ruger .357 lcr was experiencing crimp jumping while on its maiden voyage at the range. i shot 200 reloaded rounds and as i fired each shot in the cylinder, accuracy went from good to waaay off.

i plan to hit the range this weekend to try out my self defense load(corbon 110gr .357 jhp) and also my practice load (armscor .38 special, 158gr fmj). i am very worried that these rounds will crimp jump too.

can anyone reccomend specific ammo that works in their lcr?

thanks!

 

[1911 Headbanger]

This is the reason why Smith and Wesson specifies not to carry anything you haven't tested for crimp jumping. I carry Speer Got Dot Short Barrel 135 gr loads in my S&W Titanium with excellent results. You should load the revolver, and fire 3 or 4 shots, then inspect the 5th round to see if it is jumping the crimp. The last thing you want, is to have a bullet jump forward and protrude from the cylinder and lock the gun up when you need it. You should also watch the handloads in your LCR or Titanium guns. Not everyone crimps the bullets well. Lead Bullets can especially be a problem. The light weight of the gun produces a very sharp recoil that can cause bullets to jump foward out of the crimp.. Whatever you carry, test it first.

 

[walt629]

Forgive my ignorance guys. What is 'crimp jumping'? Do I take from the thread inference that the unfired bullets will creep out of the brass cases during the firing of adjacent rounds?

 

[1911 Headbanger]

Forgive my ignorance guys. What is 'crimp jumping'?

The lightweight of the Titanium or lightweight revolver allows the recoil to be much faster and sharper than a standard weight gun. As you fire the shots, the bullets in the remaining cartridges can be jarred enough to slide foward out of the case mouth of the cartridge. If it slides foward enough, the nose of the bullet can protrude out of the front of the cylinder, and will block the cylinder from turning, and locking up the gun.

 

[walt629]

The lightweight of the Titanium or lightweight revolver allows the recoil to be much faster and sharper than a standard weight gun. As you fire the shots, the bullets in the remaining cartridges can be jarred enough to slide foward out of the case mouth of the cartridge. If it slides foward enough, the nose of the bullet can protrude out of the front of the cylinder, and will block the cylinder from turning, and locking up the gun.

Is this something common to only reloads or can this phenomenon occur with factory loads?

 

[bulletsnbrains]

I've always crimped using a roll crimp on my .357/.38 rounds. By any chance are you taper crimping ? I've loaded up my GP100 with some seriously hot rounds(pushing out primers or at least flattening them), but I have never jumped crimp. Suggest increasing the crimp a little at a time till you have eliminated the issue. Run a box of commercial bought ammo to see if it's just your rounds.

 

[Illinois sucks]

i got the reloads from a guy i work with. he said they did gave strong crimps, but were fairly hot. he is making me a new batch with stronger crimps and on the lower end of pressure. in the mean time, i am hoping to test my commercial .38 and .357 defensive loads and get positive results. i really like the lcr, just alittle annoyed with the hiccup. i have a new sp101 to try also, and am hoping for better results.

does anyone on here shoot a lcr or sp101?

 

[Illinois sucks]

went to the range tonight. fired 150 rounds of armscor .38 special fmj thru the lcr. also, i fired 10 rounds of corbon 110gr .357.

the .357 corbons had NO crimp jumping at all. the .38 armscors did have some crimp jumping on the 4th and 5th round. however, not all did this and none affected the operation of the cylinder.

i also shot 100 rounds of the .38 specials thru my sp101 with 2.25 barrel. no problems what so ever.

i produced better accuracy with the lcr, more consistant and also at a much further distance. i really really really like the lcr .357 model. probably my most favorite handgun tthat i have ever fired.

 

[Purple]

Is this something common to only reloads or can this phenomenon occur with factory loads?

Happens mostly with re-loads, but has been experienced in factory loads as well. That's why the manufacturers warn about the problem and ask that you test and validate ammo and only use the ammo recommended by the gun manufacturer when noted.