I really like that 'double hole' loop set-up. Have to try it next time. I particularly like the fact that you can tighten it up, and it seems that it would hold that position. Super.
I also don't want to have any metal around the gun, so I came up with the rig shown in this pic. You just take a short strap of leather, cut a slot in one end, and make a little 'spear head' on the other. Then I use some thin "CYA", (it's a sort of 'super glue' we use to make balsa models with, and dries VERY fast.) I soak the little spear head with it, which makes it quite solid, but still not abrasive. To fasten, just put it around the stock, rotate the spear 90 degrees and push through the slot, and then let it rotate back. It is then positioned so that the 'barbs' on the head are ACROSS the slot, and will not pull out. The biggest disadvantage to it is that you must measure pretty well before you cut. That's why that double hole rig now appeals to me. It avoids this.
Of course if you are in a hurry to get to your gun, this doesn't work very well. So far, I've not needed to get to it that fast.....
P.S. Here is another pic; shows the construction of the strap a bit more clearly. The 'spear head' end has a narrow section, as you can see, that allows it to rotate back so both ends are in the same plane when you are set up. Holds the revolver very well.
These pix were taken while I was still working on the holster/belt. It is now stained, and the belt has cartridge loops on the back part. The gun is my old, (stolen, now replaced by a new one) Ruger SS in 22 LR. Grips are my own custom-made of walnut