In the black powder days the second number was the amount of black powder in grains, 45-70 was a .45 caliber bullet and 70 grains of black powder, that's left us with 30-30, 30-40, and 45-110 even though they are not loaded with black powder any more. On loaded ammo today the manufactuer doesn't put the amount of powder on the box only the weight of the bullet.
Hope this doesn't confuse you.
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