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I would have thought you could get at least 2300 FPS

Those are just a few initial loads I tested and not at max. I'm thinking like you that 2300 is doable. Woodleigh states on the box, "recommended impact velocity of 1800-2200fps". I wonder what might happen if impact was much over that. I make 2420MV in my 350WSM with them.

I must try them someday in my 35Whelen AckImp. It's VZ 24 Mauser 98 with a 24" light sporter barrel of unknown pedigree (twist 14"). Can seat bullets to 3.400. Should be good for those bullets.

http://35cal.com