Sounds like you like the big stuff. My kinda guy.
Without looking it up, I'd guess the 444 300s had about same SD as the 350 in the 450 Marlin. BUT, the Gold Dot/Uni-Cor is a FAR better/tougher bullet than the XTP. It absolutely drives deeper and retains more weight. Especially at higher velocities.
My general feeling on the 444 is that if a 350gr won't do it, I'd rather step up in caliber than weight.......
