Pearson Diamondback, 29" #70 shooting shockwave100 tipped goldtips with 59 ft lbs of energy.
Killed one at 12yds and one at 17yds this year and a grey squirrel also at 12yds. I think I'm going to pick on those noisy tree rats alot harder this next year though. I was very comfortable and confident with shots in this range.
I always have a good idea what my max. effective range is but saying how far I'd take one at would be too hard. Every situation is different and the conditions definitly have everything to do with it.