The 13 pound spring did seem to help operation of the pistol in general. With the stock spring, I had several issues where extraction and ejection seemed to not complete in pretty much every stage I shot. The lighter spring as reduced that greatly, but it has not completely eliminated it. Last Thursday, I still had a couple of them.

Also, the lighter spring seems to have made the pistol a little less forgiving about about case mouth tolerances and thus I had a few failures to go into battery.

In my defense, though perhaps it’s not a truly warranted defense, I have found that I can have rounds that drop freely into the gauge block but close observation reveals a tiny bit of the flared mouth remains. This might not be an issue on a Glock 22, with it’s native 40S&W magazines, but using the 10mm mags and a 40S&W conversion barrel might introduce enough geometric change to take up all the usual tolerances and result in a failure to go into battery.

Message received, Cody. I need to mic those case mouths. Adjusting the crimp die will be very simple and will probably take care of it.

So, with the BUG match coming up this weekend, I have two critical ammo related problems to address.

Even the lighter spring on the Glock isn’t quite light enough for the current load, so I need to bump up the powder charge just a little. As I am using the Lee Pro Auto Disk powder measure, I will just go up one cavity size on the disk. I think I’m using the 0.40 cc cavity and the next larger 0.43 cc cavity should raise the powder charge to about 4.8g. This should add about 50 fps to the velocity, but more importantly, about 31 foot pounds of energy to the slide.

Of course, that whole paragraph applies to shooting the Glock. For the BUG match, I’ll be shooting the Kahr, and I haven’t tried that ammo at all in that pistol. The current load might work, or I might need to bump that even higher for the Kahr. I may be able to test that this evening.