Superior vs Superior Heavy liners

This is from FX USA web site

I bought a superior heavy liner for my .22 700mm. I shoot knockouts and they grouped awful out of the heavy liner. However, they group really good out of my slug A liner. The knockouts are 25.4 grains.

Pay more attention to twist rates (and PartNumbers).
Slugs are spin stabilized and pellets are drag stabilized, each needs its own speed and spin, also each behaves different with more or less choke.
How they (FX) names the liners is absolutely secondary.
The best thing to do is, you pick your calibre + what twist rate you want + find that liner + decide you want more or less choke.
Your FX rep would be a best help I guess.

Edited