Another two cents for Missouri Bullet Company. They make bullets at both 12 and 18 BHN to suit your needs and quality is as good or better than any other commercial cast bullets I've tried.

Prices seem reasonable to me and especially so if you buy a bunch - they use a medium flat rate box so will ship up to 65 pounds worth for $16.00. Their Hi-Tek coating is good for indoor ranges since they don't create extra smoke but the standard lubed ones are cheaper and the smoke from the lube doesn't really matter outdoors.

Gunnery, gunnery, gunnery.
Hit the target, all else is twaddle!