As many reported above, the quality of the ammo makes a big difference. I prefer CCI Standard Vel 40 gr, and it is outstanding also Aguila SE 40 gr standard. Any .22rf will lead. My 6" 617-6 will keep all rounds inside a 1/2", most all touching, (red dot, sand bag rest at 12 yds). When I shoot Remington or Winchester bulk ammo there will be 2 or 3 outside that group. The cheaper ammo, whole not terrible is not 100% reliable on accuracy.

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H Richard
SWCA1967 SWHF244