I set my target scopes a little further forward than optimum and pull my eye back till I get the 'shadow' and the image is small..its really easy to center the image up and remove all parallax.
I k ow they're all made by Winchester, but I really like the Winchester brand of 20 grainers..got a bad batch of American eagle stuff that didnt shoot well at all and had some defective rounds where the bullets were crushed.
In my ss HB Bmag, Winchesters shoot between 3/8" and 3/4" at 100...