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I have an FX Impact in 22 with 600mm STX barrel. Added plenum kit and Huma port and probe. Shoots JSB 18 gr accurately all day long with no issues at about 940 FPS. I have tried slugs, JSB and H&N and FX. I can get them all to shoot accurately but only for about 40 to 50 shots. Then accuracy...

I got one of the new type which is held on to the end of the barrel with rubber bands. Tried it out and POI with it attached dropped by 11/2 inches at a range of 45yds shooting at 900 fps muzzle velocity. This on a FX Ipact. Seems rather a large discrepancy with such a light weight attached...