poked a coyote at 467yds with 224tth put the cross hair on his bottom jaw and hit him dead centre of his breastbone not very much holding the two parts of wiley e togeather after that 75 amax sure suprised me and him
if you are building take a google at the 224 tth ( 6mm-22) 75 g amax at 3700fps 1x8 twist 3in. high @ 100 still 3 high @ 300 5 low@ 500 27in. pipe works very well so far dont know about barrel life