Shot my CZ's a bit this weekend. I was able to get MOA groups with the 452 using Remington 17 gr. Accutip-V Boat tail and almost MOA groups with the 527 using Hornady 55 gr. V-Max. The fault was surely mine, though. The 452 Varmint is scoped with Bushnell Trophy 6-18X 44 mm AO, and the 527 is scoped with Hawke Eclipse 30 4-16X 50mm Sidewheel AO, lighted reticle mil dot.