Have a Gov't size 1911 in 9mm that seems to have a preference to 115gr ammo and what the builder recommends. I typically prefer 147gr ammo for both target and self defense, but slide doesn't go fully home. Slight pressure on the rear of the slide fixes that problem. I've shot the same 147gr ammo in Commander and Officer size 9mm 1911 before with no issue. I can appreciate with the tighter tolerances and precision that goes in to a semi-custom/custom 1911 can make them less forgiving with certain types of ammo, but this surprises me. This consistent with what others have experienced?