lcr crimp jump test-f.m. reman.

[old fart]

i decided today that i would put my lcr through a test, i only have freedom munitions 9mm hollowpoint reman ammo. i have 60 boxes of it as i bought it to shoot through my ex nano. after selling the nano i found the lcr 9mm and bought it. after buying it i heard about crimp jump and almost sold it for peace of mind. today i ran a test of 115 grain, 124 grain and 135 grain all reman freedom munition hollow points. out of a box i had a few crimp jump with the 115 grain on the 5th round, none were completely out but very close, not every cylinder full jumped but enough that i'm glad i have no more 115 grain. the box of 124 grain jumped once in a box and it was also shootable and not out of the case, i have several more boxes of these and i believe these will be ok. i did not have a single crimp jump with the 135 grain box, i will be getting this from now on. i didn't have 147 grain to try but if i get some i will update. also is it normal to have more recoil with heavier ammo? it seemed the recoil in the 135 grain was a little more, not a whole lot but noticeable. thought i would put this little thing to the test today, it's my regular carry and i needed to have peace of mind. it is loaded now with 135 grain. the trigger is amazing, my brother inlaw has a smith j frame and has said he wished his was this smooth. thanks

 

[Fiv3r]

It's funny. I almost made a thread asking about lcr crimp jump today.

Academy Sports had the 9mm lcr on clearance for $459, and I couldn't pass it up. I've been missing my lcr since I traded off my first gen .38 special lcr a few years ago.
I have plenty of .357/.38 revolvers, but the idea of a cheap to feed snubbie is attractive.

I haven't shot it yet, but I have some short barrel 124gr jhp that I plan on testing out soon. I'd like to find some cost effective 115gr to practice with and a good premium ammo for carry.

All I have on hand is some cheap steel case that I hate to feed my autoloaders.

If I can work out the lcr's diet, I think it might be a real winner. Heavy enough to be a robust gun capable of heavy use, light enough to pack every day, cheap enough to feed to gain proficiency, and (hopefully) able to digest the wide variety of 9mm self defense ammo.

I thought I read somewhere that ruger recommends 115gr ammo only?

 

[murf]

i think a lot of folks assume the heavier bullets (more inertia) will jump crimp more than the lighter ones. and they don't take into consideration the increased surface area (more bullet tension) of the heavier bullet.

it seems you are seeing the increase in surface area of the 135 grain bullet (tension), compared to the 115 grain one, more than makes up for the greater inertia of that bullet and, therefore, has less tendency to pull out of the case.

murf

 

[Drail]

Bullet pulling has always been a problem with ultra flyweight revolvers. If any of your ammo has insufficient case neck tension on the bullet they will pull (or set back in a semi auto). Crimp has almost nothing to do with bullets moving unless they have been heavily crimped into a groove in a cast bullet. It's actually case neck tension that holds them in place - not the crimp. And poor neck tension seems to becoming more common in mass produced factory ammo - even when fired in heavy weight guns. The causes and solution for this problem have been known for many many years. It is just in the last 15 years or so that factory ammo with insufficient neck tension has become pretty common. It used to be pretty rare. I have been shooting a S&W 625 revolver for many years with handloads using bullets up to 255 gr. and I have never had any bullets pull because I make sure the bullet is held firmly enough it cannot move even with no crimp applied to the case. Same thing for 300 gr. .44 magnum handloads.

 

[MikeJackmin]

i think a lot of folks assume the heavier bullets (more inertia) will jump crimp more than the lighter ones. and they don't take into consideration the increased surface area (more bullet tension) of the heavier bullet.

Thank you!

Given that bullet jump is a legitimate concern for some shooters (including users of the Boberg and Remington's new copy of it) I'm surprised this is not directly addressed by the makers of 9mm defensive ammo. Perhaps before long it will be.

 

[Jim Watson]

That is a pretty severe test for bulk reloads.
Try some name brand factory loads. Maybe off the Boberg approved list.

 

[Drail]

It's not really a "new" problem, the ammo manufacturers have known about for years. But they only have to sell their product - none of them offer any guarantee the the bullets won't pull in some of the extremely light guns that have taken most of the market today or that customers who constantly rechamber the same round repeatedly won't have set back issues. They don't care. The lighter you build the gun the more inertia you have to deal with. This is simply another very good reason to load your own. You get to control the quality of the round.

 

[C0untZer0]

I guess any owner has to test whatever carry ammo they decide on but it does make me wonder if your tests are an indicator that Hornady 135gr Critical Duty will resist jumping crimp.


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[kcofohio]

I haven't got around to my more in depth test. But the best (least) crimp jump was with Winchester's 115 gr. Silver Bullet JHP. The 5th round was, IIRC, about .007" pulled. The worst was Federal Value Pack 115 FMJ (plated). The Federal 5th round, the bullet pulled completely out.

As Drail said, it is about neck tension.