My unregulated .177 from a full fill starts out just under 800 up to a max of about 834 back to 800 for about 90+ shots with 10.65's, it shoots the AA/JSB 10'S just a little better.
My Daystate Regal shoots 10.34 JSB Heavy's @ 900FPS out of the box. It shoots good enough that I never considered changing anything. I did try the JSB assorted match pellet par to see if anything would shoot better but none did.