well i got my chrony yesterday f1- red , set it on a old table grabbed a assortment of pellets and the xl1500, i loaded the rifle first with crosman premier hollow points , shot three shots through it and i smelled something funny like hot or melting wires and it quit!!! lol been wating several weeks for this thing . any ways it is on its way back. the 3 shots i shot through it were 1368 1382 and 1361 whether it is right or not i don't know but i will get back at you when it gets back. david