The most boring pistol caliber to cast for....
IMHO it's .40S&W/10mm.
Very few boolit molds available. You basically have TC, SWC and WFN. There's not even a lot of SWC molds available. I know Accurate has some listed in their catalog but I can't stretch my $$ that far.
I love shooting my 10mm pistols but casting for them is work, there's just nothing exciting about it like there is for other calibers.
The most boring pistol caliber to cast for....
Nothing boring about it. Less bullet selections is a good thing. Saves you money in the long run. I have four molds, two WFN, one RF and one RN. Spans weights from 180-220 grains. That's enough selection for the cartridge.
In comparison I have thirty-five 35cal molds. Some of those are for rifles. But the selection just means I shoot less of all of them. I could honestly cut it down to a few molds because most of them don't do any better than the others.