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FX IMPACT .25 ?'s

Twist rate of the few inches of rifling in the end of the barrel is 1:16 The pellets skid through this part of the barrel and don't full engage with the rifling so it can vary. Can pick up as little as 1/3 of the twist rate. For ballistic calculators I use 1:30 Pellet weight and speed will give differing twist rates. 
I think it's R/H twist. Someone else may know for sure.