Re: How to sight-in a LR rifle
You will probably find that staying on large sheets of cardboard for test groups works OK out to 600 but after that you would be better off shooting at large steel plates spray-painted white so that you can see your bullet impacts through your spotting scope. Not many spotters will enable picking up bullet holes past 4-500 yards, maybe six in the right light.
We use large 2' by 4' plates that are 1/2" thick, hanging from old swing-sets or wooden saw-horses. Prefer to have four feet width because of wind challenges. We can see bullet impacts out at 1000 yards when the plates are painted white.
Suggest you plan on obtaining a set of "come-ups" - a simple list of elevation settings required to hit point of aim out to the longest distance that you can shoot lethal-sized groups to. We start at 100 yards and move out in 100 yard increments to four hundred, then shoot in fifty yard increments. We get actual drop info and record both the actual scope setting and increase from the previous 100 yard setting. In other words our chart will show that I need 15.0 minutes for a 700 zero with my .300 Win. and that is 1.75 minutes up from the 650 yard zero.
Many rifles shoot flat enough out to 300 that hits are assured if we place the crosshair on the critter's upper chest. Many guys will check their dropchart, note that they need three and one half minutes (or whatever) for their 300 yard zero, put it on and add come-ups from there if the critter is farther out.
I only hunt with my .308's to 650-700 max so have dropcharts that go 100, 200, 300, 400, 450, 500, 550, 600 650 and 700. Found out that we need fifty yard increments after four hundred, so might as well shoot them when you are getting your come-ups.
Many guys rely on the ballistic tables created by computer programs, and they are working very well. I believe that most guys prefer to shoot their drops, unless they are shooting at extreme range which makes actually getting drops pretty difficult.
Unfortunately other factors such as barrometric pressure and temperature can start influencing long shots so the fellows keep meticulous notes on shooting conditions on a continous basis for reference.
Not sure which Swarovski scope you plan on, not many have actual target turrets, particularly in MOA. Tend to be metric. That is why most guys here go with Leupolds, Nightforce, Burris, Bushnell etc. with 1/4 minute adjustments and lots of latitude in the turrets.
Good luck, you will have a lot of fun with your LR rig.