5 1 3
Scope
4 2 6
I use the same cross/star pattern I'd use on a 6 bolt vehicle wheel. Since scope rings require (in my opinion) a little more care, I usually set the gap even then get screw #2 just barely touching the ring - I then tighten the pattern starting with 1 to 'finger tight', then 10in-lbs then 18in-lbs. I then go back over them all to verify 18in-lbs.
For 4 screw arrangements I use:
1 3
Scope
4 2
I've personally found that you can actually make very minor (<1degree) cant adjustments by setting the cap basically level with the reticle so one side is a bit low. I get the screws touching on the "low" side first, finger tight the 'high' side fully, then back off off the screws on the low side slightly and re-tighten the 'high' side.