LOL. That was (mostly) tongue-in-cheek. There is some great info on that forum, and some really really nice people. I just got to the end of my last 500 round box of hardcast 158 grain SWC and frankly I'm happy to see them go. I'll be shooting plated for mid-range Magnums and .38 Special loads from now on. It isn't that much more expensive.
I was into 10mm Auto before it sold out and went mainstream, but these days I'm here for the revolver and epidemiology information.
Real men are smart enough to send their cylinders to Douguy over on the CB forum for honing to precise and consistent dimensions.
He gave a very detailed description once of how Ruger reams their chambers and why you often have two different throat dimensions (3 chambers each, or it might be three dimensions of two each) on a 6-shot revolver.
I checked my GP100 10mm and sure enough, I had 3 that took a max .403 gauge and 3 wouldn’t (they would accept a .402). I
I had initially made the mistake of trying the .403 gauge once, which happed to be on one of the tighter throats. So then when every throat then took a .402, I called it good.
I was into 10mm Auto before it sold out and went mainstream, but these days I'm here for the revolver and epidemiology information.
The story I read was the original owner of the forum tried to register “Cast Bullets” .com with the internet gods but someone was already squatting on that name so he tried “Cast Boolits” and it wasn’t taken. The guys there have used the misspelling to differentiate cast from “J Words” to the point that now it’s their schtick.
FWIW I’ll just not worry about cylinder throats unless a problem crops up. It’s possible to worry about minutiae to the point it ruins the fun. Both of my .357’s will accurately shoot .359” bullets without leading, my 10mm’s works with .402”, and my .44 Mags shoot .431”. As per Ruger’s apparent spec my .45 Colt’s are the problem children with odd throats and thread chokes. Doug Guy sorted out the 5 1/2”s cylinder so it puts 270SAA bullets into 2” at 25 yards without leading, I still need to send him the .45 acp cylinder to alleviate the .450” throats. My thread choked 4 5/8” Ruger .45 Colt just lives quite well on a diet of jacketed (j word) bullets.
The quick & easy test is to drive an oversized soft lead slug through the bore (known as “slugging”). The slug needs to be pure lead and big enough to fill the grooves.
Then see if the engraved slug will fit through your chamber throats. It should slip with very little effort, at most. If it doesn’t, the throats are probably too tight.
Almost but no cigar...from Berry's - 1.58" OAL and .357" bullet - https://www.berrysmfg.com/product/38357-357-158gr-fp-tp
You just had to snowflake with your hundredth of an inch in OAL and thousandth of an inch in diameter.