The more I shoot this rifle at this tune, the more I find that it is very sensitive to follow through. I usually do my target practice at 33 meters and at that distance, the rifle is definitely accurate but only if I really concentrate on my follow through. My Veteran Standard .25 tuned to 45 FPE has considerably more recoil but that rifle feels like a laser beam compared to the 25 FPE Short. With the Short, the groups start to really open up (1 cm +) once I start to get tired and don't pay as much attention to the follow through.
I have taken some squirrels with 1 shot with the Veteran Short at 30 and 40 meters so the gun can definitely do it, but I've also had some that took more than 1 shot so my confidence with this gun at those distances is not 100%.
I attribute this sensitivity to the long lock time with the JSB King going 670 FPS. I also tried the King Heavy on the same tune and got very similar results.
I'm also running the gun at very low reg pressures; 65 bars. I don't know how that affects accuracy but I vaguely remember reading some people say that higher reg pressures is usually better... I'm not 100% sure though if I recall that correctly.
The rifle is very good at the 15 to 20 meter distances that I bought and tuned it for but it's still nice to have a rifle that is easy to shoot accurately at longer distances. However, I'm not sure if it's worth to tune it to 33 FPE. 33 FPE would give the same muzzle velocity with the JSB King 25.39gr as my Standard with the King Heavy at 45 FPE. At that tune, I'm sacrificing noise and the relative safety of the lower power for closer up varminting. I can also just as easily grab the Standard Veteran if I need to shoot at longer distances since that gun spot on and much easier to shoot at much longer distances.
The Standard is actually more hold sensitive than the Short. I have to firmly hold the Standard against my shoulder to control recoil, but barely grip the pistol grip. I hold the Short in a similar manner but I notice that it's not as picky to the way I hold the it. Maybe because it hardly has any recoil at its power tune. It's just the follow through that it's picky with.
I'd like to add that I typically shoot on a tripod without buttstock support. I can probably improve consistency with support at the back but I don't want to practice like that because I don't hunt varmints that way.
It’s a learning experience ! 
