I have had difficulty at times getting good groups with my Beeman RS2. I thought that it was extremely hold sensitive, but it turns out that that pellet choice has a huge effect on accuracy. Mine will do < 1/2" groups at 25 yds and sometimes even put them in the same hole as long as I feed it Crosman Premiers or RWS Superdomes. Using those two its actually fairly insensitive to hold, but if I use anything else (at least anything I've tried so far) I get patterns instead of groups. Its weird, like shooting two different guns. Its very accurate with pellets it likes and absolutely terrible with anything else.