sighting in 1-4 scope

so sighted my scope in and man my new gun shoots flat. i have the same zero at 50, 100, 200... at 300 use the 200 BDC and at 400, i use the 300... 20 inch barrel with 55 gr..
 
at 50, 100, 200, basic "sighting in" target, shot steel at 300 and 400, not sure how big the steel was.. also shot steel at 200,
 
I was having a terrible time trying to sight in my sig rifle/valdada setup on sunday. I got it grouping 2" at 25 yards then moved out to 100" and never could find a consistant group at that range. Heck I was having trouble even getting onto the target at 100" Any tips?
 
Accuracy that poor means somethinh has to be wrong mechanically IMO. What changed since the last time you zeroed it?
 
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