.357mag recipe

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Here's a question that's been bothering me for a while...

Why is it that you can't download H110 more than 3% when loading magnum pistol cartridges, but can download H110 approximately 50% when loading subsonic ammunition for .300 Blackout?

Now back to your regularly scheduled topic...
It's about the pressure. How do you figure it's downloading it 50%?
 
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