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I have a fx impact (factory power plenum) in 25 cal shooting jsb mk2 33.95 king heavys. I have a 600 mm barrel. What reg setting and hammer adjuster distance should i shoot for? Ive been at it for a week and i can't get good consistent fps spread. Help!

Question. I've been having this problem with my mk2 impact (factroy power plenum) in 25 cal slowly dropping fps over a shot string. Usually drops up to 20 fps over a few mags. The first few shots of my current string are around 977 then goes down to 967 after 40 shots and over a few more mags it...

How fast can i push the 25 cal jsb hades out of my impact while still being accurate?

I have a power plenum fx impact in 25 cal 600mm barrel with the slug liner shooting nsa 33.5 slugs. Im looking for help with the correct fps i should shoot for and reg setting. Thanks

I have a fx impact mk2 with the factory power plenum in 25 cal with the 600mm barrel and slug liner. I plan on shooting 33.5 grain Nelson slugs. Whats a good speed to shoot for? Id like to be efficient as possible but i do hunt with this rifle (groundhogs being the biggest). Thanks!

I'm looking to find a seller in the us that sells a mk2 hammer spring? Or do any of you have one for sale? Thanks

I have a .25 cal mk2 impact that came with the factory power plenum. I'm trying to push heavy slugs as fast as i can. The only mod I've done is opening the barrel port in the brass and the pellet probe. That mod alone gained me 40 fps! Looking for suggestions on what else can be done to squeeze...

What's your best shooting 25 cal slug out of your fx slug liner? Details are appreciated!

I have the new .25 cal fx impact mk2 with the stock power plenum 600mm slug barrel shooting 33.5 grain nsa slugs. I can't get over 938 fps! Here is how i did the quick tune to figure this out; I backed out the valve adjustment knob past line 4. I Maxed out the hammer spring with the Allen...