I'd like to know if the OP bought the SK Viani mount. We need a review on that.
Way back in the thread I talked about my brilliant idea of putting the set screw in at the rear of the EGW mount so that you could null out any kind of cantilever movement on the base. I used a little piece of milk jug plastic to act as a shim between the set screw and the receiver so I wouldn't mar the receiver with the screw. I really admired my brilliance at that piece of work.
Maybe I was a little bit ahead of myself on the brilliance thing. I had a chance to get the rifle out and work on tuner settings yesterday. Started off shooting two shot groups from 140 to 180 on the tuner (Harrel's) moving in 5 click increments. I had things adjusted so that I was in line with the horizontal axis of the row of bulls but a little off to the right so I didn't blow out the aiming point. Shot ten 2 shot groups and decided to zoom in on the 163 to 172 setting moving one click at a time but still doing two shot groups.
I use a one-piece rest so I dropped down a row on my tuning target and popped the first shot at 162. It hit about 1/4" low. All of the next groups were also low by about that same 1/4". This should not be. Since I had previously shot at 165 and 170 one row up and all was OK, I was a bit stumped as to what was happening.
Next culling was to do 5 shot groups from 168 to 172 on the next row down. Again, the shots were low but even lower now by almost 1/2" !
I picked 169 as the place to be and dropped down another row to do consecutive 5 shot groups at that setting. There is a bit of a story with me adding a 7 ounce weight to the tuner after which i had a series of very good groups but that isn't relevant at this point. But, about half way thru this string, I got tired of hitting low so I adjusted the scope to get things back on the bull. 3 more groups on this row and three more on the next row were all at the same POI with no downard drift. It appeared that the rifle had, miraculously, healed itself.
Came home and this morning started to clean the rifle. I picked it up and - KaBoom! - my brilliantly constructed piece of milk jug plastic fell right onto the floor.
So, the screw loosened up and the back end of the EGW base moved down. The front of the scope moved up and that pushed the POI down. I ordered set screws today that have the nylon tip. I'll use these and Loctite the set screw in and I should be home free from now on!
So the moral is to not feel so brilliant because when it's revealed that you're not....well.....you just feel kind of dumb.