I've got some 300 gr. unicores and some RL-7..

And a sweet little Model-94 Timber carbine that needs to blow a hole in a big hog.

Any folks have some loads to share?

What are 'unicore' bullets?
If they are jacketed, 45 gr. of RL7, crimped hard with a Lee crimp die.
If they are cast, use a ball powder, such as TAC, or H335, about 50 gr., do not crimp, just press flared case back to bullet. They will not move, and I have gotten better accurace with ball powders with cast bullets... with all rifles.

Speer plated soft-points

Start just like Jed says, with 45 gr. and work your way up.
Reloader 7 is superb for the 444 Marlin.