You S510-SL is designed for a particular pressure setting from the factory and can or should not be changed. The owners manual stated how to fill the rifle. DO not attempt to over fill it. It can damage the rifle. See you owners manual or download a new one from (see the link below)
To increase the power of an Air Arms S510, you can try adjusting the hammer spring tension or regulator pressure. Another option is to use heavier pellets, which can provide more power due to increased weight. It's important to note that modifying the power of an airgun may impact its accuracy and potentially void any warranties, so proceed with caution.
Approx DistanceFrom: Georgia, United StatesTo: Miami, FL, United StatesSuggested Routes:1I-95 S510 mi, 8 hours 32 mins (In current traffic: 8 hours 32 mins)2FL-91 S543 mi, 9 hours 19 mins (No traffic information)