I picked the x39 as I had spoken to four different people who I trust who had shot a number of deer (100 or more) using supersonics and then gone to the x39. They all to a person said that the x39 was noticeably better at killing. Go figure. On paper they look the same but there you have it. I have shot over 200 deer and pigs with my x39 and cant fault it so am happy with my decision. I was referring to twist rates needed for long sub sonic projectiles. Cheers
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