I just ordered a couple of 6mm blanks with 8" twists, one finished at 25" and one at 28". For the 100 - 107 grain match bullets (which are a lot longer than the 100 grain hunting bullets) you are going to need a 8" twist. The 26" will work great out past 600 yards, I shoot 26" barrels in 22.250, 243 and 6.5x284 out to 1,000 yards.
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