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I have had success at 750ftps in a Wolverine R. I didn't push them any faster as my. 22 Wolverine R isn't about power at around 30ftlbs. Tested out to 50 yards I could put five shots through a ragged hole with a consistency that really surprised me.
It all depends on how fast the barrel can twist the slugs, if it can twist/spin them fast enough then the slugs should have no problem flying at 700 FPS.