Re: moa Question
For 99% of folks, myself included, all the things OTHER than verification of a good drop chart is not essential or warranted. (That statement will get the Purist's excited!)
For a target the size of a coyote, I'd have a good (verified) drop chart that included some temperature variations.
Use a chonograph and get an accurate velocity for your load. Get/use a good Ballistics program and get a ballistic printout based on your velocity, bullet BC, terrain altitude and normal temperature and humidity (these are listed in rough order of importance, most to least). Get the printout in 50 yard increments at a minimum, you can extrapolate to a smaller amount from that. Get to an area where you can set up some targets to your desired maximum range, do this on a calm day with the temperature range you've selected. ZERO THE RIFLE AT 100 YARDS..... NOW, estimate the wind speed and apply windage correction (with your rifle I'd start at .5 MOA for every 100 yards for a 10mph full value wind) use the drop chart and put the 200 yard data on the scope and fire on the 200 yard target, record the horizontal and vertical distance from your point of aim and the center of the shot group for that target. (Fire your shots when the wind conditions match the conditions of the previous shot.)
Repeat the above procedure until you're completely frustrated [img]images/icons/grin.gif[/img] or you've completed the drop chart verification to your maximum range.
The MORE important data here is the vertical displacement information of your groups. Adjust your drop chart by using the theoretical chart and the actual data from your verification, you should now have a good drop chart for that rifle and load.
The wind data is good in that you'll have an idea of future wind calls and adjusting for the wind. If it get's too confusing forget about adjusting for the wind and concentrate only on the drop data. In a perfect world, AND FOR THE PURPOSES OF THIS EXERCISE, all horizontal displacement is wind if you have a good 100 yard zero.
Don't worry about the Earth's rotation, spin drift, or rain. Concentrate on marksmanship fundamentals, drop charts, wind and shooting on angles.
MOST animals don't know what a gun is, they don't recognize the report of a rifle as danger, especially if it's a good distance away. Animals that are routinely shot AT learn some danger signs, the sight of a person is about the #1 danger sign, stay out of sight. Some learn that ANYTHING out of the ordinary is a signal to vacate the area, this includes loud noises. But they sometimes also learn what is considered a safe distance, shooting noises at 800 yards is probably not something they have learned to associate with danger.
I'd try the sighter shot as many folks here use, the coyotes may not feel threatened and you may even be able to entice them into coming closer. After a while I'd say that for ranges of 600 to 800 yards you'll be able to skip the sighter and get first round hits but you'll need to have good charts and be observant.