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I have a 6mm variation of the Seeley Masker Wasp (on an L461) using de-rimmed 30/30 family cases and get 3060fps with WW748 and Nosler 85gr partitions. Around 3700fps with 55gr BT's on the same case with a 26" stainless barrel.
Action rails were opened up, a new mag box made, the follower widened and the bolt face and extractor opened out. It is highly accurate & with the 55's gives nothing away to a 22/250, with 85's is a match for most 243's with 22" tubes.
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