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8 twist barrels will shoot 40's just fine. Load them where you have plenty of neck / bearing surface contact, ignoring how much they jump. A load that is concentric will always shoot better than a load you are trying to touch the lands with. Bullets will shoot when jumped and, even with an 8 twist barrel I would bet your freebore is not that long anyway.What rifle are you shooting?
8 twist barrels will shoot 40's just fine. Load them where you have plenty of neck / bearing surface contact, ignoring how much they jump. A load that is concentric will always shoot better than a load you are trying to touch the lands with. Bullets will shoot when jumped and, even with an 8 twist barrel I would bet your freebore is not that long anyway.
What rifle are you shooting?