I started load development for my 375 Whelen Improved and the 300gr PRVI RNSP with BigGame powder. Velocity was good accuracy OK, but it would not feed reliably from the magazine. I need a shorter OAL for it to feed, but with BigGame I couldn’t get the bullet any deeper because of how much powder being used (very compressed). So I’ve decided to change direction with a faster burning powder. Winchester Staball Match is between Varget anf W748 on the burn rate chart so I’m going to give it a go. I’ve got 5 rounds loaded up, one of each powder charge going up in .5gr increments, to where I feel like the max charge should be. My velocity goal for this combination is around 2400fps.



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