12 ft/lb Single Stroke Pneumatic quest.....

Another option would be picking up a self contained PCP with built in pump such as a Seneca Aspen or American Tactical Nova Freedom they shoot 15fpe on LOW setting straight out of their boxes and you can adjust them via hammer spring to lower their power to your preference. Use the pump as a regulator to top off the sweet spot. YO!
 
My Sportsman does 620 w 14.3s on 2 pumps. My Dragon is virtually identical to yours for power but it's a 22. I had a Dragon FT in 177 but it would only do 10.1 ft lb and the trigger/valve assembly was nowhere near as well made as my current one. The Sportsman is much harder to pump. A single stroke COULD be a GREAT Ft rifle if you could actually get 11.5 ft lb out of it without excessive effort. Haven't seen it yet though. A multi pump would need a free floated barrel as the difference in stress from different numbers of strokes causes lateral or vertical change , depending on the direction of pump. My Sportsman (and all I've worked on) moves laterally. The difference between 2 and 3 pumps is 3/4" at 50 yds w 14.3s. My Sharp Aces are better but there is still some. The Benji's, Crosmans, and Sheridans are more difficult to detect because they are under pumpers, but the effect is still there. A single stroke never varies because the stress is always the same.

Food for thought ...

Bob
 
Great info Bob. I was not aware of the need to free float. I wish I had a Sharp Ace like you. 

The Parker Hale Dragon does have a very nice cocking gear driven cocking linkage. It kinda looks even more complex that my SSP 10 meter Feinwerkbaugh 603. Both linkages give a lot of mechanical advantage. A 2 stroke Field Target free floated rifle would sell like hotcakes. Most countries are limited to only 12 ft/lbs. The market is there and the ability to be free from a refill tank is appealing.