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Anyone have a low power tune for a .22 600 MM Fx Impact M3 shooting NSA 23 Gr Slugs. 

Good day all, I have an issue with my FX Impact Mk2 Power Plenum. I have tuned it numerous times using all the techniques available. I can get it to were it is extremely stable with very low fps and sd, The thing is the gun will shoot well that day but if you let it sit for a while it will...

Hi everyone, I have a .25 MK Impact Power Plenum, i can tune it to where it is extremely constant but if i set the rifle down for 5 minutes it will drop 10 fps from my standard tune, if i let it sit for an extra 10-15 minutes after that shot it will go down another 10-15 FPS. after 4-5 shots...

I am thinking of buying a superior liner but cant decide in which one, has anyone shot the 34 gr Nielsens with them and if so which liner has grouped better and at what fps Thank you. 

Hi, i just went through the process of installing power plenum on my .25 FX Impact MKII and through the process of my first tune. Below os the picture of my final Chronograph. I keep getting these random 884 fps at times. Trying to tune for 895FPS with the 24 gr JSB Kings. I don't know if these...