Berry's plated rounds are soft lead with an itty bit amount of copper on the outside which is insufficent to stand up to the wonders of polygonal rifleing. If you download the cartridge, you will find a point where the bullets stop tumbling. You will also find that the Glock won't cycle.
Two options:
1) Go back to jacketed or hard cast lead.
2) Get a lighter recoil spring for your Glock.
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There are two types of men: those with guns, and those at their mercy.
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