double tap stw 160 accubond

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Hey guys, I have been shooting some double tap 7mm stw 160 accubond loads. Their sub moa in my rifle and was wondering if anybody knew what type of powder and primers they might be using. I`m north of the border so it`s a real pain to get any more up here. I still have some so I can pull a bullet and measure the charge but I doubt I would recognize the powder type.
Thanks for any replies
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