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Tuning Fx impact mk2 .25 500mm slug liner tuning/slug/pellet ideas

Any ideas thoughts on the 500mm heavy slug liner in the compact impact .25?I have one on the way and was going to start with the Neilson 26.8 and the hybrid fx slugs. The Neilsons shot fairly poor at 20 yards with the stock pellet liner. The FX shot better than the Neislsons but not as good as the pellets. Any suggestions FPS REG or HSA settings as a starting point for slugs. I know the barrel is short is there a velocity that i should stay away from with such a short barrel?

I would like to be able to shoot pellets and slugs with out changing the liner. Should I expect the same accuracy with the heavy slug liner as I am with the pellet liner?