I've used a 265 gr cast gc bullet from a Lyman mould with my C&H as well as Hornady 220 gr rnfp jacketed bullets. Both have worked well for our small (120-140 lb) whitetails, pass thrus, dead deer, one shot each. Probably 2-3 with each bullet so not a huge # but enough to convince me they work. My rifle does not like to feed spire points so I've stuck with the round noses but have avoided the 270s due to lower velocity produced by the cartridge.
Best.