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Grand vs.magnum

I've noticed you'll get a touch more fps with a little less powder in 6.8 Western and 300 PRC. With that said, VihtaVuori powders were equally as fast and more accurate in both my 6.8's. Still testing the 300 PRC.
I'm confused? You get better muzzle velocity with less powder but vit powders are equal? So you don't get more velocity out of grand?
 
I'm confused? You get better muzzle velocity with less powder but vit powders are equal? So you don't get more velocity out of grand?
The initial comparison was btw Magnum and Grand. But in my testing for my two rifles, N565 and N570 were faster and produced better groups than Grand.
 
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