casting buck shot
I prefer to cast my buck shot, even though it is time-consuming the results are far better. I find that accuracy is almost double due to the hardness of the pellets vs. standard lead buck shot.
In the first picture I used 9 31 cal (in between 1 and 0 buck) nested in a normal 1 1/8 oz shotgun wad. Weighing in at 395 grains - each pellet averages about 44 grains - (just over 7/8 oz) with 20 grains 700X has a velocity of 1300 fps. Nice and easy to load, excellent for your milk jug, fridge door, neurotic squirrel

etc shooting requirements.
These are 33 cal (00 buck). Cut the petals off any standard plastic wad (or use a bps gas seal and a couple of 12 ga felt wads) and load as usual. These weigh in at a total of 475 grains - each pellet averages about 53 grains -, just under 1 1/8 oz. I like to use long shot powder with this load and you can get them going up to 1500 fps if you choose to go that fast.
Because of the hardness of these pellets I don't have to screw around with using buffer which is a PITA, accuracy is excellent and as far as costs are concerned 4 cents for a primer, 1 1/2 cents for a wad, and whatever 20 to 35 grains of powder will set you back. In my case the loads I like cost me about 15 cents a piece.
I haven't hunted with any of these so I can't vouch for this application but I can't see why it wouldn't work.