Expresso, there are three reasons for this happening. 1) bulged ammo; 2) dirty chamber 3) barrel incorrectly fitted. Since you're using factory ammo and it doesn't happen with much frequency I would suspect #2. While not one of the big 3 causes a relaxed grip can result in this as well. Clean the chamber thoroughly and concentrate on keeping your wrist locked while firing. I believe you'll find the problem will disappear. Emery cloth is available in most hardware stores. George
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