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I've had several 300yd+ kills with my .221 (non AI). A little extra velocity from the AI configuration should get you to 400yds.
I prefer the 40gr B-Tip with LilGun @ 3,600ft/sec.
It is a calm weather rig. /ubbthreads/images/graemlins/grin.gif
VH
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I prefer the 40gr B-Tip at 3600fps as well,but I can barely get that out of my .222 let alone a fireball are you using a 36" barrel or a shooters Chrony to get that vel.?
Oh yeah! It might even go farther. I have seen a .22 hornet hit a 9" gong every shot on a calm day, and the fireball improved would be quite a bit faster. Would be fun.