This is a very hard choice to make...Well since you already have a 280 that you'll have at your disposal to use..I'd go with the 45-70 to use and play around with..mainly because I'm partial to that caliber,and it can do a great job on whitetails out to 250 yards with the right load,and you can use it for just about any other critter that comes your way too :wink:
Mac