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1 in 9 works on rimfire 60gr bullets at subsonic speeds. I was recommended a 1 in 7 for 80 and 90 grain at supersonic speeds. If you are wanting those, I would suggest a tighter twist for subsonic than 1 in 7".
I asked JD Jones about it recently, as I was interested in a 22 whisper. He said they have made a bunch on the 22 hornet as well as the 5.7 FN round. He also was quick to point out the 22 SSS rimfire ammo with the right twist makes a lot of sense for less money.
I'm looking for the right bolt action 22 hornet, and have hopes to exceed the accuracy and range of the 22 SSS. Now if I can just come up with an old BRNO in 22 hornet for the right price....
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