I don't know what my personal "limit" is...but I am prepared for stuff out to 800 yards. Conditions would have to be really good and I'd need to be rock solid with no chance of getting closer before I would attempt that though.
The furthest I have attempted is 600 yards, on an elk. He was about to get into the trees to bed, it was the last day of the season and I needed to have him out that day, not the next so waiting for him to come out in the evening wasn't an option. One shot and he was down.
