I could probably make it work-- they are just about next to each other on the burn rate chart-- but my understanding is that the IMR is quite a bit more temp sensitive than the Hodgdon. I can bide my time for a little bit.
Fully understand H4895 is about as obtainable as fairy dust right about now, but if anyone has a pound or two to spare within a 12 hour drive of the front range I'd be interested in buying it. Face to face only.
I've not reloaded .300 WinMag but, in other calibers I've used (in order of preference): Norma, Hornady, Nosler (poor experience with 6.5 Creed, great with .257 Ackley), Starline, literally anything else, Winchester.
Just loaded a batch of 6.5 Creed in Lapua LRP that I'm excited to give a try.
Always felt like the 6Rem got shortchanged. Properly twisted, should have been able to beat .243 by 100-200fps with heavies. An AI version would be *real* interesting.
Tikka has started twisting their .243 Win barrels 1:8 to better accommodate heavier-for-caliber 6mm projectiles. Will be a little bit slow still for the really long bullets but the Hornady 103gr. ELD-X or Berger 108gr. Elite Hunter doing about 3000fps should be hellfire on any deer or pronghorn...