I used to be able to buy 12 guage bird bombs, they are 12 guage rounds that shoot a firecracker out to about 100 yards and then it explodes. they have worked great for scaring off coyotes but no one has them anymore, just the ones that you need a special launcher to shoot.
has anybody made their own. have some old blackcats that I think would work and I understand the principle but it might be better to go from scratch and use a better quality timed fuse and a "round" that would better fit the barrel.
having same problem with 37mm grenades but found a source for reloading those this morning and the "kit" they sell may work as components in the 12 guage rounds.
any real world experiance? feel free to use pm if you don't want to talk openly and I hope this does not break any rules, if it does mods feel free to delete it.