Air Arms Owners Club

Hi I have just got a s510 .177 it was second hand but virtually new. It was doing 11.1 when I got it after two months it is now doing 11.4 with jsb exact what's worrying me is I tried bisleymags and h& n hunter extreme through it and the power jumps massively over 1 ft pound is this normal.? My hw100's don't increase by much, I assume I can turn it down by turning the screw on the rhs under the silver plug or is it more complicated then that?

Yes you can turn it down the way you have said.

BBF

pcp's are in general more efficient with heavy ammo. i use JSB heavy 10.28g in my EV2. Before that i used JSB exact 8.44g, in this configuration it was running 11.4 ft/lb, when i changed to the heavies it was right on the 12ft/lb limit with no mods. i just turned the venturi screw in to reduce power output.
so yes it is normal. as for creeping power, my rifle has gone up in higher temps, and even when i neglected cleaning the barrel. i usually clean it after circa 200-250 shots. i neglected this once and noticed that some shots were higher in POI on targets. chronoed the rifle it was running i bit higher than normal, cleaned the barrel and it was back at original power, POI back to normal. there are a multitude of things which could affect the out come. As i have found out with advice on my springer chrono with weighed pellets. i have had some pellets out of the tin which weighed 0.5 grain + - the stated weight, this of course will have an effect on the muzzle velocity.
Gary.