IWB is the only way Ill carry my 637, the exposed hammer pretty much kills andy chance of pocket carry, and as stated by others, not a good choice anyway. I use a patriot industries iwb holster, its made by a local guy, not sure hes around, but its a knock off CB holster, I hear great things about the CB but I really dont see the price tag being realistic, not when there are other options. Im not 100% worried about the comfort, whenever I start thinking about how my holster gets itchy or anything, I think about not having it in a situation like the one in Colorado, or one that happened near me in Mississippi while I was in Jackon, a 16 year old kid shot a gas station attendant in the face for 3.50 in gas. That makes me suck it up, a few hours of being slighty uncomfortable is worth my life.
Hornady makes the Critical defense in 38, Im a big fan. But the Speers are just as good if not better.