Looking for sugggestions on scope power range for 600 yd shooting. I would like to become proficient at this range to be able to hunt barbary sheep and antelope in wide open country. I also plan on using the scope for the occasional coyote at that distance and friendly competiton target shooting (maybe bowling pins or pie plates...that size range). I mention target shooting as I figure in order to become proficient shooting at that range I will be spending alot of time at the range so I might as well have fun with it. Since it's a hunting scope I will be going with a 40 to 44mm objective. Would a 4.5-14 or 4-16 be appropriate, or do I need to be looking at up to 18 to low 20's range? Does anyone know of an accepted standard, or is there a chart or table that outlines what range a certain power is good to?