What purpose are you reloading for?
Hunting? Paper punching? Silhouette?
Who will be shooting?
You? Wife? Kids?
Jacketed bullets are often more accurate than cast, until you work up a loading of the diameter and lube that your rifle likes. Generally, stay under 1700 fps for cast, probably around 1600 fps. You may find your rifle likes a certain weight, or certain manufacturer's products, probably because of the lube. (My 1895 needs at least 0.4595" diameter bullets for best accuracy, or jacketed.) Gas checked bullets can be driven as fast as jacketed bullets, but may not be as accurate as jacketed. Coated bullets do well also.
Powder is probably secondary to bullet selection, but 3031, 4198, Rel 7, and Varget often come up as favorites. For light loads, Trail Boss and Unique are popular. BE CAREFUL NOT TO DROP A DOUBLE CHARGE WITH UNIQUE!!!
The beauty of reloading for 45-70 is that you can load from mild to wild. And the bullet doesn't need be the heaviest or the fastest to be effective. You can load to your level of recoil tolerance.