This is the third crimp creep test that I have undertaken. For the unfamiliar, in a nutshell: crimp creep is a phenomenon that can occur when firing heavy loads in relatively light guns. During the firing of other cartridges, the bullet in an unfired round can “creep” forward out of its case from the intertia incurred while the gun is experiencing recoil. I first discovered this while testing a Ruger SRH Alaskan; the results and a more detailed explanation can be found here.
Given how lightweight (only 13 oz.) the Ruger LCR is, crimp creep seemed a valid concern a priori, especially when using heavy +P loads.
Given that 2009 seems destined to go down in history as the year of The Ammunition Famine, I’ve had trouble getting a wide variety of ammunition to test with. I’m publishing the results as I test, so this will be something of a living document.
Summary and Conclusions
Admittedly, there aren’t yet enough cartridges tested to draw any far-reaching conclusions, but…it appears that the LCR is relatively impervious to the crimp creep problems that plague some of the larger-caliber defense handguns. Nonetheless, I still recommend that once a round has been loaded into a gun that is then fired, that this ammunition not be re-used in subsequent loadings. Also, handloaders will want to ensure a good crimp on their rounds, and test for creep with their own recipes.
If you have any questions or comments, or would like to submit another brand of ammunition for testing, please feel free to contact us at the author’s email. I welcome your input.