I also know this is an older thread, but that's good info Tumblewwed. Now the Berger 200gr. 20X is another option. Little longer nose and boat tail, with a touch less bearing surface ( i.e. higher B.C.) should result in slightly higher velocitys. If the meplate is the same size as the200 hybrid, it may produce similar terminal results.
I have 300 Mag with a 1:10 Broughton (25") barrel that gets 2825 fps using a 215 hybrids. Which is a tad slow, and I'm ok with that. But I'm with you on the fact that when it gets colder and I go elk or muley hunting in higher elevations, my calculated BC drops because my 1:10 twist is marginal for the 215's. I kinda feel I'm leaving some performance on the table.....
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Brent