As above. The Berger 210s and 185s will work in a 10 twist. Your best bet is to talk to Mik. He’ll guide in the right direction. Like all smiths I know, they want a happy customer. Just bear in mind there’s no such thing as a throat for everything, but if you throat it for the 200 hybrid it will shoot the 20X, 185 Juggernauts and both the 210 SMK and Berger, but not the SMK #2231.