well for a 1/2 lb. charge(its shipped ready to mix for 1/2 lb. charges) they say 100 yards should be considered the safe zone, up to 50 lbs is legal to use at once, a 5 minute venture to Youtube can find dozens of videos of it being misused, FPSRussia uses it in unsafe manners most of the time he uses it, if we used it the same way he uses it out at the Pit we'd probably be met by the MSP in a matter of minutes.
1/2 is Alot, enough to easily identify a hit target at 1000 yards(which it was designed for)
If i go, individual charges would be alot less than 1/2 Lb. what i normally do is take shotgun shell hulls and seal the ends with cotton balls and duct tape, fill them as heavy as you can pack it in, and then seal the other end. you can get a dozen shells filled with 1/2 lb.(think power of a single firecracker in each) that way easily, they still go bang and the safety zone can be more like 10 yards assuming there isnt alot of light,loose debris around.
