Tim,
Just my opinion, but the Remington factory 405 gr. JSP can't be beat for the money. It pushes the 405 gr. bullet at about 1350 FPS, has great penetration, and is more than enough for most N. American game. The Buffalo Bore, and Garrett loads are heavier hitters, but at close to $50.00 a box, they ought to be. The 45/70 would be a good reason to reload, there's just so many great cast bullets out there for this caliber. For me, reloading adds another level of enjoyment to shooting.
Don