I dont think there is any point in buying the carbine at those power levels.
Umarex quote up to 10 ft lbs?

However having shot my .177 pistol at the range I am very impressed with it.
Good power,plenty of shots and accuracy good on 10m paper and 20m cans.
Tuesday this week so cool but not cold as today.

The pump cocking is actually rather nice.
I prefer it to the HW 44 side lever.

Its not quite as good as the 44 but still very good value at £250 ish.
Best buy for me for a while despite its looks!