Got this off bsa owners group, first sub inch grouping with .25 cal, these jsb's are taking over in .25 cal, actually it's well below an inch! just over half an inch, amazing pellets!

http://bsaog.co.uk/forum/index.php?topic=9336.0

Also heard it through the grape vine that they will be launching a 31 grain pellet in .25, think i am totally converted to .25 now.