FX Impact .25 Ammo question..

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How do you know? Did you try them? I have and the liner will shoot them. Not saying that’s what you will wind up finding the best accuracy with but it will shoot them. When I was still playing the liner game before just machining a real barrel for my gun I mainly shot two slugs. One of them was bigger than .251, I promise you.
I've tried to shoot the 33.6 .254 NSA slugs, and they jam, when I go to load them into the chamber, same goes for .253 Zans. I haven't tried .252 or .251, but I'll give them a ahot
 
Like I said, it depends on the manufacturer. I never tried a NSA .254. You are definitely safe in the 249-251 area though. Zan .253’s chamber fine in a standard superior liner using factory style probe. No pin probes here.
Pin probe would make a difference with tighter fitting slug the factory probe might not be as small but would keep a slug straighter when or if they go harder