Forrest r - That hasn't been my experience with the H&G #51 in .357 Magnum or .38 Special. Neither of us have tested using all the same bullets. My work has been limited to comparisons with #358439, #358429, and #358156. I've tried these in various alloys and diameters. I prefer the #51 over the others I've used. I'm not a powdercoater; I've had good results with conventionally sized and lubricated bullets.
Yup & people like skeeter designed the 358156 because every thing he tried failed including the H&G #51. But for some odd reason your #51 out preforms everything else.
The very nature of the design shows the era in which it was made. Namely the need for large amounts of substandard at best lubes. Hence the small drive bands and large lube groove. That cramer # 26 is from that era (that large square lube groove thing). But the cramer design has a huge bottom drive band/bullet base that does an excellent job of sealing the cylinder throats and bores.
I'm glad the #51 works for you, the rest of the world, not so much. Don't think so??? Take a hard look at what's being sold by commercial caster for the last 30 years, it sure ain't a copy of the h&g #51. If it's such a good design you'd think people would be putting their hard earned $$$ down and buying them or asking the commercial casters to make them so they could buy them.