I kinda like .177 for cost and choice of pellets myself, but certainly do have some other calibers that most folks don't think of when 'bb gun' is mentioned.
(http://i165.photobucket.com/albums/u64/3n00n/38.jpg)
Soda cans don't stand a chance at 80m with the scope setto 2x shooting cpl or Vogel match pellets. Both7.9 grain pellets shootnear 900f/s with cpl being 10~15f/s slower.
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Basics shoot between 995~1010f/s, but don't retain velocity very well. The jsb exacts seem to shoot alot higher poi but mid 800's velocityand not so consistantwith groups thatare less than impressive.
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Logun pentrators also shoot very well, but try to buy themanymore . . . (http://www.getphpbb.com/phpbb/images/smiles/a_doh.gif)