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I'm not to max pressure with WC872 like I am with H-50 BMG.
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wc872 is the better powder for you. I'm ordering some myself (not for my 50 BMG's tho). Amazing it works so good and is so cheap - breaking the old cliche <font color="green"> You get what you pay for
If it works for Kirby I'm betting it will work in my Kirby guns
Now if I end up having Kirby build me a 7mm with a 48" barrel, I might look for an even slower burning powder.