I posted the first part of this elsewhere, but thought you might benefit from the thoughts and comparisons:
BBs have become my favorite shot. 6000 BBs come in a bottle for $10. I can fit 100 of them easily on a magnet on my wire frame - they weigh next to nothing and take up virtually no space in my pocket. They create less litter on my property and work themselves down into the earth very quickly (10s of thousands of BBs have disappeared
into the earth around my home and businesses). I use the lightest possible bands, so my shooting sessions are longer, and I don't worry much about repetitive strain injuries. For me, that's the biggest benefit of BBs.
Using BBs, I can put holes in cat food cans using super light Alliance 117b rubber bands, and I can put more holes in each can because they're smaller. BBs shoot fast
, so within the range I like to shoot, they fly straight (not as much drop down) - I'm very accurate with them. I can more clearly see how accurate I my shots are on paper targets because the holes are precise.
I love shooting just about everything, but for my daily target practice and "sneak out back" time every day, BBs fit the bill perfectly.
When I feel like breaking things, and with bigger bands (Theraband, Latex from Tex, and Chinese tubes), I use 3/8 inch and 1/2 inch steel, and .44 lead. Lead balls do the most damage, but they become deformed quickly.
Indoors I shoot yellow foam rubber "reball" rounds (used for testing .68 paintball guns), and some other various sized rubber balls that I've found on Ebay. When shooting indoors, an odd flier with this ammo doesn't do any damage (at least in an enclosed hallway).
Gumballs are fun to smash against trees in the woods, and they're completely biodegradable. I also recently started shooting taconite pellets in the woods (got mine at http://www.ebay.com/itm/160658537403
). They're just like really round rocks - no one would think they were anything other than rocks if found in the woods, and they pack a punch.
I don't like marbles much because broken glass can cause problems, and they don't go away. Pennies, hex nuts, and other odd shapes are also not my favorites because they don't fly straight over longer distances. Animal foods pellets and nuts are biodegradable and fun to shoot in the woods, but they're too light and mis-shapen to fly straight for target practice (my fiance will only join me for shooting if we shoot food into the woods - helping animals with slingshots - kinda the opposite reason many people pick them up
Other ammo that I've tried and dislike include airsoft pellets - because they're too light and don't make a satisfying sound when plinking. The biodegradable airsoft that I've tried don't seem to be nearly as biodegrable as steel BBs. I tried crystal elegance water beads once - kinda cool, because they break apart into a shower of 1000 droplets when you shoot them (totally useless for target shooting, but a neat display for an audience).