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Finally got to the range on Sat. I tried 1680 and LilGun. The 1680 was consistently cycling and fairly velocity consistent. I didn't shoot for groups...there was a suppressor issue sending the occasional shot far to the right by several feet. Strangely though, while a few brass shavings came out of the can, there were no smudges on the rim of the exit end and I couldn't see any damage or rub marks inside the can.
I'll take the raw data to work tomorrow, load it into excel to crunch the data, and report back. Ballpark...10.5 gr 1680 should be right on 1040 in a 8.5" with a 762SD attached.
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