Have you checked out the Diana LP8 Magnum? I got one a while back, it's one big break barrel pistol that does 5+lbs out the box.
Very well made.

http://www.airgunstate.co.uk/shop/Di...um_-_.177.html


Customer Reviews
A monster of a pistol!
Geoff B - Wirksworth
This is a real beast of an air-pistol - powerful and relatively heavy, but it's beautifully balanced, solidly built, well-made, and great fun. The spring is powerful but no problem when you get used to it, and delivers a real punch. I particularly like the way cocking the gun automatically applies the ambidextrous safety, and the spring-loaded ball that ensures a good seal. The fibre-optic sites are fine, and while I've tried a red dot sight I've reverted to the open sights. Diana is a very reputable German company and the LP8 clearly lives up to their high standards