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Thanks - I'll give this a go. All the tutorials and posts indicated to me that adjusting the thumbturn micro knob was more about smoothing the action of the hammer once you were at / near your desired velocity. Might adjusting it a few clicks get me from 740 fps to 880 fps ?

This was what I was trying to do - but I couldn't get to 102-3% of my target speed in the first place. It seems the gun just won't get there, which is odd because nobody in all the posts or tutorials I've read and watched even mention the possibility an M3 can't get to 800-900 fps. As I said...

This is the odd thing - I can't get anywhere near 800 fps - which I thought a .25cal M3 should be able to do, without any modifications.

It's a 700mm Superior slug liner. I'd have thought that most / all FX M3s were the same / similar out of the box. Unless there are lower power ones sold in the UK where I am ? But mine's on a Firearms Certificate, so I assume it's the same as all the other .25 cal M3s out there ?

Hi there Guys - hope you're all well. I've attempted to tune my FX Impact M3 in .25 calibre, to shoot JSB King Heavy MkII 33.95gr pellets at what is considered to be their optimum velocity of around 880 fps or so. As I nudged up the 2nd Regulator in 10 bar increments, this is what I saw. (I...