Ron, rk, I fixated on the Mark IV designation in Ron's posts and missed that he said it was .455 faced off for .45 ACP/AR. If that is the case and what you were speaking of, rk, I apologize. I thought we were taking about the ".380" British round, what we call the .38 S&W, especially since rk mentioned the 180 gr. bullet.
If we are speaking of the .455, then your 5.0 gr. Unique with the 180 gr. bullet is a light load. I will back off extracting my foot from my mouf.
|