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if anyone has shot 60 grain partitions in a Vixen?

No I haven't.....I've pretty much confined myself to 40-50 grain bullets.

The 60 grain bullets IMO are suited for the 22-250 and 220 Swift. That said....I wouldn't hesitate to shoot deer with a .223 and a 60 grain bullet but doubt my particular 1-14" twist will handle it.