I have this exact choke and gun magnum blends put 206 in 10 inch circle and 420s in 20 inch circle. The nitro straight 7s put around 280 to 310 in 10 inch circle but the magnum blend us the most even hope this helps really all the testing I have been able to do . I won't be buying any other brand of choke for my other guns the people of jebs are awesome.