More fun to purposely shoot at - if at 300 to 700 yards out - but we normally shoot 1 lb or sometimes 20 lb tanks.
Sure would like to try a 250 lb tank sometime, although cleanup afterwards would be a pain.
Tracers or incendary work fine, or any high-powered rifle, with use of a lit candle about 50 feet behind it.
OldmanFCSA = "Oldman" at www.fcsa.org
FCSA Member, SCSA Member, NRA Member, & AMA Member
"Oldage & Treachery will overcome Youth & Skill"