My observations are along the same lines as JB et al. Haven't seen a noticeable difference between standard and match primers( though I use them fairly often just because....the price difference isn't earth shaking), but I've seen major changes between using standard and magnum primers, when using ball powder, or slow extruded. I'm not a long range guy, having never fired a shot at a big game animal beyond 300 yards or so. How it affects accuracy beyond that, I can't speak to.
Jeff
