The holster at the link below will work with that revolver.
https://www.opticsplanet.com/galco-phoenix-strongside-crossdraw-leather-belt-holster.html?_iv_gun-model=smith-and-wesson-model-629-n-frame-revolver-5in
No, this holster will not accommodate the Kimber K6S.
The model you need is on product page https://www.opticsplanet.com/bianchi-5bhl-thumbsnap-plain-tan-right-hand-10261.html and the product code is BZ-HT-5BHL-10237.
You will want MPN: 10245 found here:
https://www.opticsplanet.com/bianchi-5bhl-thumbsnap-plain-tan-right-hand-10261.html
Bianchi does not offer any holsters that are meant for the Ruger GP100 6".
Unfortunately Bianchi does not make a version of this holster for your barrel length, but they do make a similar holster that will fit here: https://www.opticsplanet.com/bianchi-5bh-thumbsnap-plain-tan-left-hand-10140.html?_iv_gun-model=smith-and-wesson-13
MPN: 10136 should fit with a little extra room in the barrel as it is for a 6" model.
None of these models will fit. Here is a link for a suede lined version of the same holster that will fit:
https://www.opticsplanet.com/bianchi-5bhl-thumbsnap-plain-tan-right-hand-10261.html?_iv_holster-size=6
Please contact us at techsales@opticsplanet.com as we will need the model and barrel length of your S&W revolver to determine fit.
None of the options on this page will fit. The correct size can be found with the following here:
https://www.opticsplanet.com/bianchi-5bhl-thumbsnap-plain-tan-right-hand-10261.html?_iv_holster-size=5