not my longest, but i just shot this one this evening about 10min after sunset or so, and took about 10 more minutes to shoot the bottom six group, the first five were real good, that bottom left one, #6, wasnt a flier, just me getting really cold and starting to shiver(25F in a tshirt)....anyhow about 330 yds......just looked at some old surveyors maps and it is actually 341.4yds where i shot at today, and according to the same maps my longest shot was at 500.66yds, but i hit a target only 9 times bigger that far out too!.
still waiting on upload sorry...