I have the Panthera in .22/700mm. FX went and changed their barrel specs (again). The 600/700mm are now called the Superior Slug liners. I was seeing wandering groups with 40gr RBT in .217 out of the box, but the choke mikes out just a tad too large for .217 ammo so to get the utmost precision you really have to size down .218 to .2175 or do a light polish/lap for .218.
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The FX Crowns are pretty phenomenal for 50y BR / N50 shooting. I know of several guys shooting consistent cards at 247-248 with them. I've had a couple that I customized / modified to shoot extremely well to 300y with 30 grain ammo. More consistent than any rimfire that I had ever owner.
I'm not a fan of the FX Impact, there's like 55 o-rings in them and that usually translates to unwanted movement under dynamic pressure. I like the FX Maverick though in .30cal. Tuning is very simple and I've setup several TJ barrels in different lengths and a few FX liners for it with a unique barrel support system. There's no harmonic issues that affect accuracy and it never has to be re-zeroed. It's just stupid accurate with a variety of ammo lol
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