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Magnum primers are supposed to burn hotter and longer, making it easier to ignite hard-to-ignite powders.
As such, for any given powder, changing from a standard to a magnum primer will generally raise pressure and velocity. The "accepted" difference is generally figured to be akin to a 5 to 10% increase in powder.
I will definitely have to do some more testing. The magnum primers did exhibit less velocity deviation, but the sample size is so small that there is really no significance. However, even on a small sample, I would have expected a marked, obvious velocity difference.
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