Mark, I like IWB (or pocket) for small/med concealed carry too. And those are the holsters I spent a good deal of time deciding what I wanted, and I've had them a long time. I mostly paid little attention to full size/heavy pistol holsters, since I would probably never carry them (except in my hands).
But I changed my mind, and decided that if the revolution comes to my neighborhood, I need to be able to carry full size (which are ALWAYS much better defensive armament than small carry stuff). Full size goes outside the waistband, strong side carry, forward cant. And I'll worry about covering them up when/if I have to, and maybe open carry on my property/street is just fine anyway. I won't be able to carry them in my hands because they will be carrying a rifle or shotgun.
I do have one of these old US military 1911 shoulder rigs, which actually works quite well.

And here's another rig I have that is neither concealed or discrete. (without a poncho)

Mine takes 8 30-rd and 1 20rd AR mags (260 rds), and a Sig P220 and 6 extra mags (49 rds), and 6 rds of OO buck, a flashlight and a Kbar. Except for the pistol, it's fully loaded and ready to go (and freeking heavy), especially over a class 3 body armor vest.