AEA AEA challenger standart 6.35 low power

Hello firends

Yesterday I received my AEA challenger standart 6.35
But there are problems with the power.
Everything is set to MAX but a H&N baracuda bullet with a weight of 30.86 gr flies with a velocity of only 231m/s which is 53 joules

Why is that?
That's only half the power.

Maybe someone has had a similar problem and solved it ?