I shoot cast bullets in nearly every rifle that I own. I've pretty much given up buying jacketed bullets for calibers like 357 and 44 mag (both leverguns), 35 Remington, and 45-70. If the bullet you are casting is the Lyman 311041, it's the very first one I've owned, and I still use it. You said you had Unique and 3031 on hand. Mauser98us mentioned 5744. That's another good one. I've always mixed my wheelweights with about 10 percent pure lead when casting--it seems to flow better that way. Don't overlook cast bullets (any caliber) retrieved from the backstop berms at your local range. They can be remelted and mixed in (sparingly) with your lead for casting. All of the posters today have offered you good advice. Probably the most comprehensive (and best I've read out of a couple of websites on this subject) is what Qajaq59 has said. He stresses going for ACCURACY. When you get to an accurate combination, write down the load for the rifle you are using, and stick to it. When it comes to cast bullets, you can safely ignore those who've conjured up their own published loads, as well as the velocity freaks who have chronographs and feel they need to shoot bullets faster than the speed of light. Stick within the ranges of published data, and work up your load for your rifle. When you find the combination, believe me--it won't bounce off the game that you are likely to be hunting with a 30-30.