I had mentioned in the "358156 HP for Beginners" thread that I had just got done modifying an extra 358156 2-cavity mould to a plain base. I got a chance to cast a few last night. Everything came out pretty good. The original base band was a fat 0.362" so I bored it to that.
I ladle poured straight WW's at 750 F. The average weight for both cavities combined was 158.8 grs with a variance of +/- 0.3 grs. Now it's time to load up a few for tryout. I'll post the results hopefully next week.
One question I have is do you think I even need to size these bullets? Both bands are 0.362". My S&W 686 has a 0.3570 bore and 0.3575 throats. With the original GC 358156 I would size to 0.3585 and get super accuracy using alox+MM.