My advice,from learning the hard(and expensive)way,is to go ahead and buy a .25 marauder.With an Air Force pump and 1400 premier pellets you are looking at slightly under 800$ from
Pyramid air.A lot of $$$,but I have way more than that in the several Beeman and RWS springers that I will never shoot again.Sell some other gun that you never use to raise the $$$-the Marauder is the most fun gun I have ever owned,and I have dozens!There is absolutely NO comparison to a springer!