Thanks for all the useful information So. The recoil screw is out, even though I had used it on the Regal, there is no hole on the Revere. And yes the the turret was turned the right way, and can a 177 pellet reach 200m. That was my 223 setup range

Anyway the rings on the Regal setup are fractionaly higher, so that fitted ok minus the recoil screw.
So today with the rain, I set up in the garage, managed 8ft on the ES 4-16x42 off the Regal, target was a bit blurry but good enough to see the gun was shooting up to 5" high and like a shotgun, so it was clipping, tried several mods and all much the same. So removed the shroud and 2" low and shots through the same hole, which I think sounds about right so close. With a long silencer on the shroud, it was clearly pointing upwards, and a straight edge confirmed it. So back to the seller

Pic. 8ft range,
View attachment 854680three shots on the lower 2" low three on the upper 3" high hardly surprising I could not find any holes at 20m