I have a CZ527 American w/21.9 inch Barrel and single set trigger. It wears a VXII 3-9x33mm EFR It does Sub-MOA with these loads.

12.6grs of LilGun, CCI-500 primer, 40gr Berger HPV, @2980fps.
12.5grs of LilGun, CCI-500 primer, 45gr Speer SP, @2900fps.
AA1680, Federal 205 primer, 40gr Sierra SP, @2720fps.

You must use the CCI 500 SPP with LilGun as is listed in Speer latest manual. The AA1680 load I forgot the charge weight but its out speers or Hornady manuals. The Speer and Sierra are the hornet bullets, the Berger is not a hornet specific bullet. I user the Lee Collet neck sizing die.

This is my Varmit ONLY gun I have much better big game cartridges like these: 270win, 35rem, 358win, 35whelen.