I just happen to have one of those
(the 6-284). I think you will find your estimate of 3000-3200 a little on the slow side (depending on bbl length). Most of us are in the 3300-3400 range with 107smk's w/26"+bbls & lapua brass. We are running COAL's of 3.0"+ (i'm at 3.100-ish) so if your running SA it would be a single shot....
Anyway, my point, albeit strung out
is that, thte 6-284 is a lazer to 1000yds & with a 20moa rail, you should have zero trouble reaching out there... i don't have my dope book or ballistic calculator in front of me buuutttt... me thinks MY real world dope at 1k w/100yd zero is in the 20-22moa area? Please forgive my SWAG, that is a rough estimate.... but should be very close.
PS- Easy multi-test. When you get your "load", establish your zero & just crank'er up, go to 20 or 25moa & back down again. Not only will you be able to verify your ability to reach your goal, you will also be testing your scopes ability to return to zero accurately.