A couple years ago, when I was 5'7"/180 something lbs., I was packing a 6" 686 IWB all the time. I just used IWB holsters designed for 4" guns with an open bottom. Honestly, there wasn't much of a comfort difference between a 4" and 6" L frame IMO. It's very doable and those long barrelled .357s hit super hard.