Federal Range Pack shoots reliably and accurately in all my pistols (Ruger Standard Model, Mark IV & S&W Compact) and rifles (Ruger 10/22 & CZ 455) and even shoots MOA @ 100 with the 455
. RWS Target ammo tightens up groups in the CZ, Thunderbolts will not run the 10/22 and Winchester causes feeding/cycling issues in all the pistols. CCI SV works well in the 455, and runs the Standard Model good too, while CCI HV and stingers and mini-mags perform reasonably well across the board but lack accuracy in 455. Tried some Armscor the other day, and so far it works in everything and accuracy is fair.