Back when men were men and giants roamed the earth: a friend and I would occasionally play auto-mortar with the suppressed MAC-10s we had. Targets were cardboard silhouettes out to approx 300M over a dirt (recently harrowed) field (distance estimated by pace, not measured). Fires were full-auto. Sights were adequate out to about 130. For 150-250M, the Ingrams were positioned close to the right abdomen, with right forearm actually braced against it. Left hand on suppressor with left arm extended straight out as a rigid brace. Then it was walk-in fires with adjustment made by sliding right forearm down abdomen. Past that distance, the dispersion pattern was such that hits were very improbable, in fact the one or two we had were at best accidental. The only indicator of effectiveness of the .45acp round at 200M was that it penetrated through some pumpkins which were 10-15 inches in diameter. Hardly a scientific test, just a couple of guys kicking it around to see what the capabilities might be.