RL-7 works good for the gambit of 45-70 bullets. Speer makes a pretty good jacketed bullet for a decent price. Large Rifle primers-not magnum.

The problem with a roll crimp is that the length of your brass has to be exact. If one piece of brass is .005 longer than the other then the roll crimped case will dig .005 deeper into the bullet. therefore pressure is not as consistent with the roll crimp. The taper crimp will not dig into the bullet as deep. This allows more consistent pressure, even if your brass is not exactly the same length. However the more consistent your brass is, the better your ammo will shoot.

Some people like the LEE dies. Personally I do not have much use for LEE products.

Belling means opening up the case mouth to allow easier seating of the bullet. The Lyman M-Die seems to do a more consistent job. That is just my opinion. If you bell your case too much then it is more difficult for the neck to hold your bullet properly(retention). If you use jacketed bullets- keep your belling to a minimum, but be consistent.

I prefer to use a separate crimp die. This adds an additional step. But IMO crimping is very important to accuracy. Tom.