Sir, you have made an exellent choice! I have a Ruger #1 in 45/70 and it is a very versatile, fun gun. Good plinking loads, 'thumper' loads for regular hunting demands and 'serious' game loads are all available.
The 'fun' loads are a 'boom'-wait-wait-wait-'thump' kind of fun and you can go all the way up to whatever you can stand to pull the trigger on! I have taken deer and hogs with mine and, to say the least, it WORKS!
Good luck and have fun!