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Do some research on cylinder to barrel volume balancing. Your cylinder is very over volumed for a 303mm barrel.
Your bb is leaving the barrel before your piston finishes its full stroke not allowing you to achieve as much pressure as you would otherwise be able to achieve. Thus even after your bb has left your piston is still moving and pushing the excess air out of your barrel.
Proper balancing will ensure optimal an optimal piston stroke and will get you your other 40fps when done properly. And if you thought your rifle was quieter before then you're in for a treat!
Or just a stronger spring.
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