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I think at the slow speeds that 338 fed will produce with those big bullets, he will need a bit faster than a 10. Kinda like a 233 pushing the 90 Bergers. An 8 twist won't work like it will with the 22-250s. He'll no doubt need an 8 or faster to spin them 300s to stability. Just my guess. The calculator will be the closest to a better guess. By the way, PacNor makes 6-14 twist barrels depending on how many grooves you want.are you gonna shoot 300gr smk with a .308 case and a 18" barrel for target shooting? who makes a 1in7twist 338 barrel. most 338 barrels i have seen are 1in10. let us know how it works out, good luck cliffe
