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I've used carbine bullets in .300 Whisper with OK results-- both SP's and FMJ's. Just fiddling around though, no real science, and I was running them supersonic through an 8" barrel. Assuming they do the same speed or thereabouts as my other 110 loads, it's like M1 Carbine +P you might say. They have fed fine but again no high volume to really prove it. And other than for close range, I don't see any advantage when comparing to 110's with much better BC's. Bet they do barriers better though.
I've even used these loaded backwards under a 110 Sierra, for a 220 grain subsonic payload. Know what? Not too bad, spread is 1-2" at 28 yards, for whatever good it would do. Don't try this at home.... the case neck is too short to hold them both reliably and I hate to think of how bad things could get if the inner bullet got loose and fell into the case in a sideways-to-bore position.
Not something I'm doing anymore, having lucked out and gotten away with it before I knew better.
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