I have a Maverick in 25 cal. Shooting the 29.5 nsa at 1015 fps. I am getting good groups at 50 and 100 but I was wanting to shoot the heavier slugs. I tried the 33.5 34.9 and 36.2 and they didn’t group well. They were all shot around 950-970 fps. But then I came across Chris form up north airgunner, see he had great success shooting the 36.2 nsa at 900 fps with the superior liner. Should I bite the Bullet and get a heavy liner? Has anyone had success with the superior heavy liner?