The 300gr fpb shot good in mine but thy are discontinued, the 300gr Thor shoots good, and the 270gr bore lok shoots good too--- all with bh209 ( good luck finding the powder and if you do--bring your big boy wallet
Powerbelt platinum 338gr shot well too but they are discontinued also
Just make sure you have enough velocity at 250 for your bullets to expand the 270s shoot at 1950 and the 300s shoot at 1850 from my cva rifle - at those speeds im down to 1100-1200 ft lbs and 13-1400fps at 250 yards ( my personal limit for ml with this set up is 200y, but u do u)
Elk ml bullets in co gotta be full bore 50 + cal expanding , where ya plan on going? What tag u put in for?