I have got a CZ452 american with the 16'' barrel and i get on best with Winchester super x hollow points 40grn (subsonic) for me, Ive tried Eley and they were slightly louder and more greasy on the bullet head which can make the bolt stiffer to use when out in cold/ wet weather and they are more expensive.Also ive tried remington hollow points they were shocking, bad grouping lots of flyers and the stopping power was no good even had rabbits run after being hit.But if i was you stick with what works well in your gun for you as every gun and person is different.