Here's what happened to some new style QRW's with the recoil lug on them when mixed with the Nightforce base that has a slot running down the middle of it. It only lets the lug contact on the outer edges, this is why the things broke... I'd recommend using Badgers, MK4's or NF rings with a full length recoil lug in the rings, or use a base that has no slt running lengthwise in it.... these two don't mix well.
Here's the target he was zeroing it in on before the Goat hunt. He installed the QRW's he bought when the Badger Max 50's he ordered ended up being to short. This is the second set of QRW's he's broke, the others were the old style and used on the 50 BMG, these were on the 338/378Wby. The rifle weighs 17 lbs and has a Holland Quick Discharge muzzle brake
on it and recoil is very little, about like a 308 win... maybe, if that. Not enough lug contact is what really caused them to bust.
I'm not sure if you can read on the target the order the shots were taken in, but I'd say after the scope was brought down a couple clicks and finally zeroed on the 5th shot, the rings broke. This gun is real accurate and should hold 1/2" groups with the 300gr SMK no trouble. The 6th shot was already climbing upward and when he shot the 7th he said what the hell! After the 8th and 9th shot he was really going what the __ck!! The scope was almost off the end of the rail at that point! He had looked after the 5th shot and the scope wasn't moving in the rings, after the 9th he looked and seen the rings had broke.