1000 yard benchrest reloading methods

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I'm going to start reloading for my new GaP 300 WSM and want to find a quick and EFFECTIVE means of finding your accuracy nodes for far distances (not 100 yards). I have a range that I can shoot to 0-1200 yards and set up a target cam.

What should I do, groups, ladder?

 

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What I normally do is shoot a ladder test with seating depths, pick the best one, than shoot 5 shot groups with powder incriments. What I find is that the 5 shot group I shot the first time isn't always the same the next trip to the range. So I was hoping to hear something that could get me more consistent data.

 

[boone3380]

I usually do a ladder at 300 yds. I pick the group with the least vertical and refine it till there's even less. Then I work on seating depths to tighten it up. Lastly I confirm at 500 yds with a couple more groups. If it's good at 500 then it's better than I am at 1000.

 

[DAVETOOLEY]

I usually do a ladder at 300 yds. I pick the group with the least vertical and refine it till there's even less. Then I work on seating depths to tighten it up. Lastly I confirm at 500 yds with a couple more groups. If it's good at 500 then it's better than I am at 1000.

Pretty much what he said. I shoot at 200 yds. to find out what does and doesn't work. Usually two shot groups the first go round. I'm just looking for trends. Then I focus in on what shot the best and tweak that. Then I move further out. No more than 600 yds. To much bad uncontrollable stuff happens past that.