Thanks Bob. I'd seen the Speciality Handgun Hunting forum under the Long Range Hunting site but was unaware of the Speciality Pistols area of the Savage Shooters forum. Unfortunately when I tried to register with Long Range Hunting forum I kept getting error messages - looks like they may have geo-blocked locations outside the US. Tried sending a message to the administrators several weeks ago but no reply. In addition there is the subscription membership at Handgun Hunters International and a small section within the Africa Hunting forum.
Seems like there are quite a few different forums all partially covering a relatively small potential member base. Would be pretty awesome if all in one place, but I suspect a lot of it may be due to personal differences from so far back no-one remembers why.