From any position other than flat prone, my shooter error becomes much larger, making it difficult to measure any changes in MPOI - however for example barricade shooting at 500m off a bag from a standing position I can achieve sufficient accuracy that I can't identify any difference in POI vs flat prone - I feel that I can still have a similar % of hits on a target vs prone. I should really go and get some data on this rather than rely on subjective impression.
May be different for other shooters, systems, particularly with higher recoil I'd expect a more pronounced difference, if the shooter isn't consistent at getting behind the rifle from different positions.
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