Used the information from this thread to start on the right track with my new Hw100kt .22. I used a vfg pull through with a felt soaked in barrel cleaner. After 5-6 pulls through it was coming out clean. I then tried job exact jumbo's 5.52 which were shooting little finger nail sized groups at 25 yards. Quite happy, decided it could do better so tried h&n ftt in 5.53 I was shocked when the groups got smaller.
The H&N FTT pellets were far more consistent on the chrono and much safer from a power perspective. Very happy with the hw100kt.