OM Blackhawks were in the following calibers;
.30 Carbine
.357
.41 Magnum
.44 Mag
.45 Colt
Than there are the convertibles;
.38/357 & .9mm
.45 acp & .45 Colt
Then the Flattop variation;
.357
.44 Mag
Throw in various barrel lengths, brass grip frames, minor variations in each model, Transition variations, etc.
Lots of areas to "add" to a collection.
MANY is the budding Ruger SA gatherer,, who says; "I want one in each caliber." Then, as they begin the search, they realize all the different ones,,,, even within the basic calibers.
I've heard that comment often enough,, that when the OP mentioned he'd achieved his goal, I just figured he'd reached the basic goal of the 5 main calibers. Especially since he mentioned NOT wanting the convertibles.
And it often happens that once these 5 basic calibers are found,, then they begin the search for the barrel lengths,, or the convertibles, or the brassies, etc. etc.
So, instead of questioning things,, why can't we all be happy for the OP for reaching HIS personal goal?