If I were gonna shoot some bear I would use my Ranch Dog 265 gr. RNFP bullets over a good load of 2400. But since you wanna purchase bullets I'll go along with the fellers above and say a 240-250 gr. Keith SWC over a hefty load of 2400 (I don't care for W297/H110). Beartooth Bullets makes a good 250 gr. Wide Flat Nose bullet available in .429" to .432" diameters (wide meplat for good tissue destruction and good weight for penetration).
Your idea of practicing with what you're gonna hunt with is the perfect answer 'cause a miss or poorly placed shot with the very best bullet ain't worth much...
My Anchor is holding fast!
I've learned how to stand on my own two knees...