You may have too much of the wrong powder and are compressing load. But, you might experience more problems with a Glock 20 as you go down the road. I have one and had major problems with it at first: It would not detonate primer in subfreezing tempertures, and due to volital cycling, I experienced bullets dislodging from brand new brass. Glock had a recal on this freezing problem and I have since purchased Lee tapered crimp dies and I run brass back partially through carbide resizer again. I love the gun and it is deadly with AA and 155 H XTP at 1325 fps. I mean deadly!!! Good luck!
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