WB
When I run the .375 WIN. I find that
Saturday, February 10, 2018, 17:00

case capacity is a big limiting factor with even medium burn rate powders like H332, BLC2 etc. I've not used it but AA1680 is said to do well, I'm trying it next.

The 200-220 gr. in it is the optimal for weight vs speed obtainable. In fact the 200 gr. gives a 10% boost in speed due to capacity and less weight. I play around 2000-2300 fps in the Winchester Carbine and 200'ish gr. bullets.

The .400 case is straight, not tapered like the .375, but does not hold much more powder. The bullets in .400 are shorter though for the same weight as the .375 and benefits there from the increased capacity available under the bullet. I should equal or be a bit ahead, maybe jump to 220-230 gr. class at the same speed as a 200 gr. .375. I'd love to play and find out. Someone suggested the .356 Win. case opened up to .400. I can make those from .444 run into a .358 Win. sizer, then opening to .400. Interesting, but I like the .400 GNR idea better, much easier and more practical.


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