My FX panthera 600 mm barrel came with the superior heavy slug barrel liner. It appears changing the barrel liner is easy and fast. If I am going to predominantly shoot pellets would it make sense to change the barrel liner to the superior liner with the 1 to 24 twist? The liner for the superior heavy barrel has a 1 to 16 twist rate making it a better choice for slugs. If anyone has performed a barrel liner change to achieve better pellet performance, I would love to hear your story. How much improvement in pellet did you achieve by changing the barrel liner? How difficult was it to change the barrel liner and what are the special considerations when changing the liner?