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I've been dealing with the same issues.
Fired 2 fouling shots then a 5 shot group. First 3 shots went into 1/2", next two were 3/4" and 2" higher.
Velocities
1-1033 fps
2-1030
3-1033
4-1043
5-1049
When I got home I weighed cases and found that three weighed less than the other 2. I think it was only by about a half a grain. I'd have to check my notes.
You need to be careful when shortening seating depth. Pressure and velocities rise quite a bit.
So far I've seen the smallest Extreme spreads and Standard deviations with AA 5744. IMR 4227 was pretty good also.
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