I up my fill to 215 BAR, based on suggestions posted and checking the Brocock website, I did not want to go much higher, as the cylinder is marked at Working Pressure: 200 BAR, Maximum Pressure: 250 BAR. Anyway, that got me past the top of the curve enough to get 5 more good shots. I twiddled with the spring some more and really could not eek out any more energy with the CHPs - 23 FPE. So I ran through my other pellet options to see what their energy is - my best showing is JSB 18.1 at 27.6 FPE, then Barracuda's at 25.1 FPE, followed by everything else in the 23 to 24.5 FPE range. I was surprised at the JSB 18's - that is the energy I am looking for. Also surprising was the Barracuda's and that they had lower energy than the JSB 18's, I have usually found that upping the pellet weight ups the energy/efficiency. The overall efficiency was 0.99 with the variety of pellets - 34 shots from 215 Bar to 125 Bar. That beats my BSA Scorpion, plus it is several pounds lighter.
I scoped it up tonight (UTG 10x compact) and did some sight in with FTT's - they wondered quite a bit, but it is windy and rainy tonight. I will have to wait for some calmer weather to sort out the pellets. Hopefully the JSBs will shoot well. The Sniper Magnums had quite a but of variance and only 24.1 fpe, so I am not sure they will shoot well. I stole the scope from my Contour S6 and was surprised to see that both guns are roughly the same length, with the Contour having a long LDC. I have a Hawke 2-7x to go back on that gun.
In regards to the manufacture date, I am not sure - it was purchased in October 2016 by the original owner, but that could have even been used. I am surprised to hear that there are .25's with the slingshot hammer - I thought they were not going to do it.
In regards to the Lane regulator, I though that it is a no-drill installation. I emailed them and they said that the Pot seals against the valve and no drilling was required. I bought a Lane for my 1720T and it included a drill, but the drill was not needed. - so maybe check the instructions.
Daniel Putz