A discussion thread came up on the BGNW MSN forum about biodegradable
stun darts, and "clay pigeons" (targets).

PhiSBA's original website used animal crackers (the ones we ate as
kids) - but left the darts for pickup. I remembered Jock Elliot's
discussion about taking walks with a stealth blowgun (looks like a
hiking staff, or walking cane), but using marbles, or ball-bearings,
and I began to think about this a bit ...

Candy canes, with the crook lopped off and a gumdrop tailcone? Leaves
a sticky mess in the barrel!

Although, using pre-made candy might have it's advantages -
especially the hard-shell type - like gumballs
(http://www.candy4u.com/gumballs.html ranging in size from small to
medium to large - from $3.50 to $5.50/;b. - again, no idea what the
caliber is - but gumballs would leave a gum residue that takes
forever to biodegrade), or jawbreakers ("Wonka" brand "Gobstoppers"
are 1/2 in. diameter (no guarantee that they'll fit a .50 cal.
barrel) and sell for $2.50 + S&H for a 7 oz. box at:
http://search.store.yahoo.com/cgi-bin/nsearch?follow-
pro=1&vwcatalog=candydepot&catalog=candydepot&query=jawbreakers&.autod
one=http://www.store.yahoo.com/candydepot/nsearch.html&I1.x=15&I1.y=11
/
Want to have the coolest looking jawbreakers? All black, 30# for
$68.00 + S&H at: http://www.candywarehouse.com/blackballs.html and
let's not forget the Red Hot "Atomic Fireballs" (cinnamon flavor) -
38# of unwrapped .75 cal. for $76.00 + S&H.

Some of the jawbreakers are huge (1.5", 2.5", on up to 4"
diameter) ... awesome slingshot ammo, or as a "baseball" - these can
most likely be used for hunting with no problem about their stopping
power! ... and missed shots - no problem, it'll eventually dissolve
or be eaten! And, if they are a little too big to fit, just suck on
them a little while, and let them dry off to size them! LOL

Hmmmmm. Walking down the street with a "stealth" blowgun, and a
pocket full of jawbreakers. No way could that be construed as a
concealed weapon!