Keith doctrine spells out equal drive bands of one tenth inch, not just equal bands, though his light 45 bullet had narrower bands.
Have you ever read or heard of how Keith 'designed' his famous 44 bullet? I read it in his writing years ago, and it doesn't fit my idea of perfect mechanical design criteria. The 375 flatnose bullet by Lyman was the most common winner at matches with the 38-55 back then, so he had Lyman use that nose and add the bands and lube groove at 44 caliber. If you can lay hands on some authentic Keith 44 bullets and measure the nose diameter just ahead of the first drive band, you'll find diameter to be very close to .375. What Keith designed did work quite well, same as when he put his haying equipment back to gether with baling wire, but it isn't perfect design. Saying that, I want it made known that few if any admired Keith more than I have, from the reading of his writing and till now. He did his best with what he had and what he knew, and I offer his designs as exactly precise as I know how, in honor of him, and to provide customers with the 'real thing'.
I believe if his 44 design were reduced to 41 caliber weight would be around 220 grains. (I've made a few molds that way but forgotten the exact weight.) If you want to 'follow Keith doctrine I believe this is the best way to keep close as possible, and I make the molds at my standard prices. Should any of you readers want to order one, contact me personally be email and I'll look up what the weight comes out at. I make them the same way for 45, 475 and 50 cal, plus many variations, including shortening to customer requested weight, and even a shortened 38 caliber. My email address is LBTisAccuracy@Imbris.net or you can email from our website, LBTMoulds.com
