Chuck 100 yd said:
In the .45 caliber it is hard to beat the Elmer Kieth designs that are fairly closely copied by almost every mold maker. Lyman's Kieth bullets are my favorites. Gas checks are only needed with the heaviest loads when pushed to the max. Adjust your alloy to match pressure/velocity and everything will be fine.
Agreed, but you won't find any Keith design wearing a gas check, he didn't like them. I've been able to push plain based boolits to over 1300 fps. with no leading problems and good accuracy in my .454's, there's no reason it can't be done in .45 Colt as long as the size matches the cylinder throats.