They make a perfectly decent mount, I'm not sure why you would want a QD on a .338, you're not exactly going to be swapping to iron sights or anything. If the rifle is running a quality brake, it really sholdnt be much of an issue. I would still only go with a double lock base and not a single, and probably 6 screw rings over 4. If you're not running a brake, I probably wouldn't run a QD mount of any variety. That's just my 2 cents.