It seems that in my neck of the woods the bullet weights for jacketed 45-70 are pretty much standard and finding load data for them is no problem.

With lead bullets, weights are all over the place and finding load data in the manuals can be tricky.

I am looking at picking up a box of 415 grain lead pills for my Marlin GG. Can any of you fellows recommend a good load for that weight? I currently have stocks of 3031, Reloader 7 and Varget.

I would just use the 405gr. data. Another 10 grains of weight isn't much at all, about 2 percent difference. What .45-70 do you have?

With a modern .45-70, you probably won't be able to get enough Varget in the case to cause any problems.... I certainly can't with my .458 Win Mag.

Can't comment on the other powders.

It seems that in my neck of the woods the bullet weights for jacketed 45-70 are pretty much standard and finding load data for them is no problem.

With lead bullets, weights are all over the place and finding load data in the manuals can be tricky.

I am looking at picking up a box of 415 grain lead pills for my Marlin GG. Can any of you fellows recommend a good load for that weight? I currently have stocks of 3031, Reloader 7 and Varget.

What does work best is to try and identify the bullet mold SHAPE and LENGTh that comes closest to the lead bullet at hand. Can make a 45 mold vary it's weight from published figures by using a differnt alloy...sofer alloys casting a bit heavier and harder alloys casting a bit lighter.

The reason for the shape and length is that how much bearing area a bullet has and how deeply it seats in the case has a lot more effect on pressure than the small variations in weight.

SO...if you look at the bullet (or post a picture here) and decide that it came from a 405gr. Lyman mold...and is a bit heavy becasue the alloy was differnt...then the data for that bullet is a good place to start. IF it looks like it was from a Lee...or a RCBS...or whatever, would start with the data published for that mold.