No, you were right. There are different sizes of Maxi-ball, and there is even a maxi-hunter in a couple sizes. The 370 grain has always been kind of the standard maxi-ball, the one sold prelubed in stores. Don't waste your money on the Lyman junk. Find a used TC mold. They are better made, and often cheaper. I have one in 50 and one in 54 caliber, and I think I paid $40 each.