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Talking Monkey
11-28-2016, 10:52 AM
I started reloading about a year ago and have loaded and shot around 7,000 rounds since then. So far, I’ve had no issues with function or accuracy with any of my Gen 3 Glocks (G19, G34). Recently, however, I’ve noticed some strange behavior when shot through a Gen 4 G34. At 50ft, the Gen 4 is grouping 2-inches high and 2-inches left. The same gun shoots POI/POA with Federal HST 124gr, Speer Gold Dot 124gr, and my friend’s light 147gr reloads. Any thoughts as to why I'm seeing a POI shift from my reloads only with the Gen 4 G34?

This is the load I’m using:
X-treme copper plated, 9mm, 124gr RN
4gr Titegroup
1.150" OAL
Crimp is about .379" - .378" DIA
CCI Small Pistol Primers
Primarily Federal and Blazer brass
Loaded on a Dillon 650

TiroFijo
11-28-2016, 11:21 AM
I could be you... we all do funny things sometimes.

What velocity are you getting? Around 1080 fps or so?
Try increasing the load a bit more, 0.1 gr or so, and play a little with the OAL. Perhaps the real, muscle memory o psychological issue will go away....

Talking Monkey
11-28-2016, 11:37 AM
I could be you... we all do funny things sometimes.

What velocity are you getting? Around 1080 fps or so?
Try increasing the load a bit more, 0.1 gr or so, and play a little with the OAL. Perhaps the real, muscle memory o psychological issue will go away....

Anything's possible, but I've been able to verify this behavior on a few occasions. I've even had a couple other people shoot the gun and experience the same high and left grouping with my reloads only.

Velocity is 1131fps from a G34.

BN
11-28-2016, 12:03 PM
I've seen it. I had been shooting 147 handloads in my guns for years. I got some 135 bullets because they were cheaper. They shot 2" high and left in all my guns that had shot POA/POI with 147's.