i'm looking to purchase a rangefinder for this fall. last year i used a borrowed nikon monarch 800 and fell in love. i could put it on a group of antelope at 600-700 yards and it would give me a reading. i could even get readings on small targets like fenceposts at 400+yards. since i don't shoot at extreme ranges like 600 yards, i was wondering if i could get by with the nikon laser 600? the opticzone has them at a good price right now. what i'm wanting is to be able to put it on a lone deer at say 500 yards and get a reading. any input???