FX crown continum MK2 double barrels

Hello everyone
I have bought the FX crown continum MK2 last year, with 380mm and 700mm barrels, but on the end of barrel from the pellet probe side there is ( one hole on up side mark with P and and on down side 2 holes mark with S), what does it means
Plz guide me
The port marked S is for Slugs, or high flow for cranking up pellet speed.
The port marked P is for Pellets, or a lower power tune.
 
No one can ‘give’ you a tune for your rifle. You’ve shot it and know where you are now. Use a little common sense and figure out which way you need to go from here.

Whats you’re velocity with pellets of similar weight to the slugs you want to shoot? Slugs will normally shoot a little slower with the same settings. Change one thing at a time and see which direction you’re going.

PS… you didn’t say which barrel you want to shoot slugs from. Big difference in settings between those to lengths.
 
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