for 25 grain, you will probably wind up closer to 110-115. I decide what velocity I want and add 5%. I then adjust the reg and max out the hammer. After a few shots I see If I'm at that +5% number. If not I adjsut reg and shoot a few more. When my reg and Max hammer give me my +5%, I start backing off the hammer and shooting a few shots till I'm close to my desired velocity. Then I would ease in on the valve adjustment easy until I'm there. About like I would get any other gun shooting 3-5% down the knee from the plateau. That has me winding up close to the middle of the hammer tension with the 3 tunes I've done so far. I'm not tuning super heavy yet. 25 gr pellets, 34 gr pellets, and 29 gr slugs. The valve is winding up close to the fourth line. Every gun is different, but this method works to find your own settings instead of trying to make someone else's work for you. I know some start with their hammer in the middle and adjust up until adjustment give no more velocity. They are then at that plateau. My way, I start at the plateau and see if it's that +5% number. If not , time to adjust reg. Less shooting my way. I'm currently at an extreme spread of 8 fps with a standard deviation of 2.6, and I'm just getting started with these slugs. I can't be all wrong. I am seriously enjoying not taking guns out of their stocks and regs out of their tubes to get to hammer tension and adjust regs. Have fun with it and try the 33.95 gr pellets. I never looked back once I got my first gun tuned to them. Great pellets. Happy shooting