My point is simply this: the bullets you trade in the morning will be shot back at you in the night. There is no logic in arming the useless eaters to whom you’ve now revealed that you a cache of stuff.
If some mall ninja bought an exotic weapon and failed to plan for ammo needs, then the fault is his, not yours. Never barter ammo; the life you save will be your own.
Aw, c’mon Old Sarge! Where’s your sense of dirty dealing? Pull out the round and pour out 3/4 of the powder, or better yet, replace that powder with something a bit more explosive.