It's likely different rifle to rife, but my Styer will string the shots vertically when I shoot it hot, MOA isn't unusual with 4 or 5 quick shots. Likely a combination of the barrel moving a little and powder burn rate. I can compensate with hold off, it does it consistently and I know my rifle.

Point is knowing your rifle is important, you can compensate if you know in advance what is likely to happen.