I second this.
Pick up a the Lyman cast bullet handbook and check the load recipes. #2 is not suitable for all loads and powders, obviously, but a large portion of the calibers will have a loadout for #2.
There is a short paragraph in one of the earlier chapters (probably want to add a bookmark to it, I know I did) that tells you the breakdown of the various common alloys. You can (more or less) create #2 from pure lead and pewter if I remember correctly (sorry, I'm at work and can't check the handbook or my recipe book)
#2 is 90% Lead, 5% Tin, 5% Antimony. Modern pewter is tin, copper, and antimony.
Use the alloy calculator (
https://castboolits.gunloads.com/sho...oy-calculators) to determine how much to add.