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9mm Unique with Small piston MAGNUM?

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a friend just discovered his first try at reloading 9mm he bought magnum primers by mistake. He's got about 100 rounds already loaded with 5.6 gr of Unique powder. Would it be dangerous to shoot them?

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Kind of depends on the bullet weight. Wouldn't worry about the primers though, a lot of us use rifle primers in pistol loads.

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They might be loaded a little hot with a magnum primer. What grain bullet is he loading? I load 115 gn bullet with 4.5 gn of Unique.

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First, did he start at the manual's starting load?

What bullet weight is he using?

Usually, if one has an established load, one would reduce the charge weight by 2% and work up when switching to magnum primers.

5.6gr can easily be an over-MAX load for 115r and heavier bullets.

I start at 4.5gr for Unique and 115gr bullets and work up.

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That's a hot load especially with a magnum primer. I would not shoot them. I would pull the bullets and put 4.3 gn of powder than shoot them with the magnum primer.

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I agree with Buddy, Unique max loads are exactly that. Do not go over, especially with the magnum primer.

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