RE: practise at what ranges
i practice out to 500 yards on a regular basis in rain,snow,wind,burning hot sun and have a full understanding of how each of those conditions affect bullet flight.i have also seen people do the same thing.i find it absoluty amazing that someone would or could base there shot on a ballistic chart with out ever shooting that range.i have also witness someone sight in with one type bullet and show up for the hunt with something completely different(becouse they were on sale)and wounder why they can' t hit anything.