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The 300 wisper works pretty well, but the closer, the better. Make sure you get an 8 twist barrel so you can shoot the 240 seirra MK`s. The .308 works also, but imo, it is harder to find a sub-sonic load that shoots well. Another thing about building a sub-sonic load, use the bullets and primers called for in the load data, one time i had a bunch of 180 gr. barnes X bullets laying around and decided to load those instead my normal load of MK`s, the first round popped, made a hissing sound, and never made it out the barrel. Not good.
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