To answer your orginal question, YES IT CAN BE LOADED WITH BLACK POWDER.
Why you want to I dont know, but thats not the question. Remember though, black powder needs to completely fill the case. Use a med grain black powder for mid size rifles, fill the case until its half way up the neck and juse the bullet seating to compress the powder. Shoot it, adjusting the powder up and down a few grains until you can get the best accuracy you can get.
It would be best if you could get a fiber wad or a grease wad between the bullet and powder.
Remember to clean the crap out of the brass and rifle after your shooting session.
Just remember, regardless of gun, in black powder shooting, case has to be full and compressed a bit. To little powder and you leave space in the case where the BP can build up pressure before moving the bullet, this could cause dangerous pressures. To much powder that has have too much compression swells the case causing feeding problems.
Black powder needs a moist chamber for any type of accuracy (thats why target shooters use a blow tube to blow moist air into the chamber between shots). The grease wad between the bullet and powder helps this also. Swab the barrel with a wet patch ever couple shots to help with accuracy.
Go for it, Have fun and be safe.