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hhunter318, that 'smith must not know that benchresters started sleeving their round Remington receivers in flat sided and bottom bars of aluminum when they began using 6mm bullets in their free recoiling tack drivers. The increased barreled action torque from 50 grain 22 caliber bullets to 70 grain 24 caliber ones was noticable by the best shooters and was cured only be rebedding the round receivers as they didn't stay well bedded for the life of the barrel. For shoulder fired rifles, round receivers are OK when bullet weight's less than about 160 to 170 grains; above that the torque's enough to cause noticable problems in a few hundred rounds.
Even bolts and nuts have flat sides so they won't twist loose in wrenches from torque.
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