LCR 9mm Crimp Creep, Bullet Creep, Jump Crimp
Seahawk here – I’m new to the forum and this is my first post.
I recently purchased a Ruger LCR in 9mm and the first time out at the range I experience “Crimp Creep”, “Bullet Creep”, “Jump Crimp”, “Bullet Migration” is when the bullet starts to work it’s way out of the case. This is concerning so after researching the forum I realized others had also experienced this, so I did a little ammo research of my own. My starting point was the ammo that typically used Federal 115gr and the remaining six I referenced Boberg’s Compatible List and was limited by what the local retailers had available in my area.
1.) I purchased 7 different types of 9mm ammo.
2.) I measured the average length of each manufactures round right out of the box with a Digital Caliper.
3.) Loaded a Ruger Moon Clip with five rounds, fired three and measure the two remaining rounds for length and overall condition.
4.) I repeated this three times for each manufacture, if there was little sign of movement on the third attempt I fired the 4th round to see after four rounds fired how did the fifth round measured up.
5.) I compiled my findings in chart, where and when available I included the manufactures bullet Velocity and Energy data.
View attachment Print_Area.pdf
Ammo Description Measure New Round #1 4th Bullet Round #1 5th Bullet Round #2 4th Bullet Round #2 5th Bullet Round #3 4th Bullet Round #3 5th Bullet
Federal 115Gr FMJ RN Vel. 1125 Ene. 323 1.15 1.21 Bullet Fell Out Bullet Fell Out Bullet Fell Out DNF DNF
PMC Bronze 115Gr FMJ Vel. 1157 Ene. 344 1.15 1.15 1.15 1.16 1.16 Fired 1.17
Stand 1 Armory Chubbies 147Gr -P 1.15 Stuck Stuck Stuck Stuck DNF DNF
Winchester USA Target Pack 115Gr Vel. 1190 Ene 362 1.15 1.18 1.17 1.18 1.17 1.18 1.18
Remington 23728 UMC 115Gr Luger 1.11 1.12 1.13 Fired 1.14 Fired 1.13
American Eagle 115Gr FMJ Vel 1180 Ene 355 1.15 1.16 1.17 1.16 1.16 Fired 1.17
Hornady Critical Defense Lite 100 Gr FTX Vel. 1125 Ene. 281 1.05 1.06 1.07 Fired 1.04 Fired 1.06
6.) Key Findings DO NOT use Federal 115gr FMJ ammo typically carried at Walmart, first attempt one bullet fell out and the other was at 1.21. Second attempt I only fired twice and all three remaining bullets and powder fell out see photo. There was no sense to continue a third round.
7.) Stand 1 Armory Chubbies, work fine in my semi auto pistols, but when I fired three rounds I was unable to depress the Ejector Rod to removed the cases from the Cylinder, all efforts to remove them didn’t work. I finally fired the remaining two rounds and was able to eject the casings and moon clip just fine. I tried it a second time with the same results? I can’t explain it, so I don’t recommend using this round.
8.) My recommendation for range practice and paper punching Remington UMC, PMC Bronze, American Eagle.
Here's pictures of my test with the Federal Ammo
I hope this helps someone and if anyone else has any recommendations let me know.