Welcome aboard to both of you! Being legal in Mississippi as primitive weapons, I'd guess that's where you're from newhunter06! If not, maybe you'd better check the regs again!!

The .45-70 isn't any different from other centerfire calibers, it's just a lot of fun tho!! Most factory ammo is loaded to trapboor levels, but there are some that are "healthier" than trapdoor that you might like to shoot. If you handload, you can load up into the modern rifle load data if you want, but due to the recoil, you'll probably choose to stay in trapdoor or lower levergun loads.
Read thru the FAQ and Help sticky, lots of good info in there on cleaning a new rifle, shoot it with a few different types of factory ammo to see what shoots best, it will probably shoot all of it good, with some better than others.
Tim