This afternoon, I managed my first 2 x 5-shot groups measuring 1.077" and 1.125", outside to outside measurement, average 1.101", minus bullet diameter, .170 = 0.931" or sub-MOA for 10 rounds at 100 yards with the CZ-452 Varmint! Hoo Ray!. I get to join the MOA club on Rimfire Central. Ammo was Remington 17grain AccuTip-V Boat Tail.