So I read up a bit on this airgun. In stock form, Pyramyd says it’ll produce 42 FPE. With that in mind, I’d shoot the JSB 25 gr. I would aim for a nice bell curve shot string (for a non regulated tune) going for a 835 fps to 870 fps and back down to 835 fps. You will have to find what fill pressure and hammer spring tension (HST) produces the 835. Usually I like to keep the spread around 35-40 fps as the POI will be influenced by this deviation. Some others don’t mind 50 fps spread or more and this is a personal preference. The larger the spread you are comfortable with the more shots you will get but POI will be affected more as well.
It can be fun tuning PCP’s. I enjoy it. I like to get my chronograph level and level the airgun as well when testing through the chrony. You may want to utilize a light kit. Either way, center the shots as best you can over the sensors and don’t shoot the chrony, lol.
Once you get comfortable with rifle and know the ins and outs, you may want to modify it from it’s factory state. I’m sure there are aftermarket parts to hop it up if you want. Let us know how it goes.
