FX 500mm STX Smooth Twist Pellet Liners.Will they shoot JSB KnockOuts?

They work in my impact mk2 600 mm pellet liner just over 1"groups at 100 m which is around 110y and at 950 fps.

I belive those groups that I shoot could be
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better in a steady rest. I was shooting from a bipod and hand as a rear rest.