Gonna have to try me some of that RL17, I guess, though when good ol' H4350 is working it's hard to manufacture a reason to mess with anything else...
The penetration I got with my .325 and the "tourist bullet" 200-gn Accubond left me zero desire to even consider a 220 in that cartridge. Maybe for giant bears or in a dedicated close-cover elk rifle or some other very specific circumstance...
The PROBLEM with owning a .325 Montana, or I suppose even a lowly 300WSM Montana <G>, is that it pretty much obsoletes everything else in the gunsafe!