I recently got myself an FX Impact X with the STX Slug Liner in .22 cal. The goal is to shoot slugs accurately and use it for long range shooting (100+ meters). I got some NSA 23gr in .217 and .217 diameter. I shot them at 25m and got very nice groups on the .217 of about 10mm at 900fps. The .218 shot at slightly slower speed of 880fps with a slightly larger group of 15mm. This must be due to the slug fitting tighter in the barrel.
I followed the tuning video of Ernest Rowe at https://www.youtube.com/watch?v=9K9uG2KOPt0&t=306s
This got me a mas fps for the 23gr .217 slugs of 900fps. The Airgun nut packaging of the slug states that best results can be achieved at 930fps, but I cant get any faster than 900 even with the hammer spring tension at max (adjusted with the allen key).
Has anyone else experimented with any other slugs with good results?
Has anyone else managed to get a stronger replacement hammer spring and got a higher velocity out their FX Impact?
I also noticed that the gauges on the FX Impact X is not that accurate. The fill gauge on my dive bottle states 220bar yet the gauge on the impact shows 250bar. Has anyone else noticed this? I have ordered 2 new gauges from huma-air to hopefully solve this issue.
Is there anyone else in here that is on a journey of slug shooting or slug development? I would love to have a chat.