Hello Harry,
The attached link is to a typical group I can usually fairly easily achieve with my .22 calibre B Series Premier on the standard NSRA 10 metre target using a single handed unsupported stance. I have shot the pistol at 20 yds but found the groups open up too much to be acceptable at that distance.
http://i1362.photobucket.com/albums/...psc7b82c7c.jpg
Regards
Brian