In .22 I normally use 15.9gr exact jumbos through my springer. I find them very consistent at 45 yards and handle long shots outdoors very well.
I've also used 14.3gr exact jumbo express, they're a bit more expensive but I find fewer damaged pellets in a tin. I've only fired about 500 of them though vs the 1500 15.9's...
In .177 i've tried alot of different weight jsbs, express and regular exacts, but my hatsan at44 seemed to shoot 10.3gr exact express the best at 45yards and beyound.