Congratulations on purchasing a fine rifle.
My 452 UltraLux shoots CCI-SV very well, averaging a little over a 1/2" at 50 yards with good consistency. So far it's shot the best with the older Wolf ME, the same as SK Rifle Match, which can obliterate the x rings on an A23-5 target at 50, with at least a couple 5 shot groups measuring about 1/4" on the same target. (Vintage Brno rear peep/front globe, front rest and rear bag, new eyeglasses prescription). Of course the thing to do is try a variety of different ammo, from different lots, to find out what your gun likes.