I haven't played with the FX barrel tuner. I have made the cf shroud with just getting cf tubes off of ebay and cutting to length. The idea of the tuner is proven in the rimfire and centerfire world so I am sure it will work.
What Steve123 said is true. I have a Impact that I worked on and it is shooting a 40gr .22 cal slug at 1015fps. So it is almost the same, maybe the same as some match 22 cal rounds. But I am getting under 10fps extreme spread on it. So it should out shoot even the best 22 just by that. I haven't put it head to head with my VuDoo but I am sure it will hang with it.
What Steve123 said is true. I have a Impact that I worked on and it is shooting a 40gr .22 cal slug at 1015fps. So it is almost the same, maybe the same as some match 22 cal rounds. But I am getting under 10fps extreme spread on it. So it should out shoot even the best 22 just by that. I haven't put it head to head with my VuDoo but I am sure it will hang with it.