Sunday, May 21, 2017

Two Updates For the Price of One

Thursday I got the Glock 29 out to Atlanta Conservation Club where it was fed a box of Armscor 180gr FMJ. The gun ran fine for me, albeit I was concentrating on a firm grip. There was one round that experienced the light primer strike/OOB malfunction while Mike was shooting it. That was round number thirty-four of the day (#64 of the test.)

Friday morning saw the stubby Glock's date with the chronograph. It's often assumed by internet pontificators that, with its short 3.77" barrel, the Glock 29 launches 10mm bullets at .40 S&W velocities. Which is almost true...if you consider that it's launching 10mm bullets from a compact pistol at velocities that barely exceed similar loadings in a 6" barreled longslide Glock 24.

I'll go ahead and list the chrono data with two numbers in each row, the first being from the compact Glock 29 and the second from the full-size Glock 20:
Hornady 180gr XTP
LO: 1035  1109
HI: 1057  1127
AV: 1046  1118
ES: 22.70  17.78
SD: 8.36   6.32

Hornady 155gr XTP
LO: 1194  1290
HI: 1238  1321
AV: 1217  1306
ES: 43.78  30.70
SD: 12.60  11.31

Sig Sauer V-Crown 180gr JHP
LO: 1052  1158
HI: 1098  1215
AV: 1071  1168
ES: 46.41  57.46
SD: 15.62  16.88
The Armscor 180gr FMJ I hadn't chrono'ed out of the big gun or, if I did, I can't find the numbers right now, but it averaged 961.7fps from the Glock 29. That Bobcat 180gr JHP that caused the issues in the first range session, by the way, had averaged 1,225fps from the G20.

It looks like the G29 gives up as much as 100fps to the full-size gun, but is still steamier than .40 S&W out of full-size duty guns. And out of compacts? When I tested Speer 155gr Gold Dots in the Performance Center Shield .40 for Shooting Illustrated, they only averaged 1,063fps, compared to 1,217fps for the 155gr XTP's from Glock's baby ten.

During the chronograph testing there were no malfunctions, other than me choking way up on the gun and inadvertently causing the slide to lock back prematurely on round number thirty-six of the day (#116 of the test.) Since that was entirely me and not the gun, I'll note it here but not in the running tally.

This makes 120 rounds fired since the gun was last cleaned or lubed, with six failures to feed (#2, #3, #12, #13, #22, #23) and seven failures to fire (#4, #7, #9, #15, #17, #26, #64). 1,880 rounds to go.