Bart B.,
You are completely correct that a flat bottom receiver is easier to bed to resist torquing because it will automatically have mechanically locked interfaces.
But, if a system is mechanically locked, then the shape of the receiver doesn't matter in resisting the approximate 2 ft/lbs of torque from a bullet twisting on the barrel.
If the system is not mechanically locked, then it can twist. The torque effect on the barreled action doesn't care the shape of the action, only how much resistance there is to the torquing moment.
From a force transfer standpoint, it makes sense that even the old cheap tupperware Savage stocks were known to shoot tight as they had pillar bedded action screws, providing much more surface area to transfer force from the twisting motion to the injected plastic stock. With a newer Accustock the pillars are just built into the aluminum bedding block.
If you go for a tube gun design and epoxy bed the entire action in the tube, then a round receiver is absolutely superior at resisting the torquing moment as there is massively more contact with the stock.
Jimro
You are completely correct that a flat bottom receiver is easier to bed to resist torquing because it will automatically have mechanically locked interfaces.
But, if a system is mechanically locked, then the shape of the receiver doesn't matter in resisting the approximate 2 ft/lbs of torque from a bullet twisting on the barrel.
If the system is not mechanically locked, then it can twist. The torque effect on the barreled action doesn't care the shape of the action, only how much resistance there is to the torquing moment.
From a force transfer standpoint, it makes sense that even the old cheap tupperware Savage stocks were known to shoot tight as they had pillar bedded action screws, providing much more surface area to transfer force from the twisting motion to the injected plastic stock. With a newer Accustock the pillars are just built into the aluminum bedding block.
If you go for a tube gun design and epoxy bed the entire action in the tube, then a round receiver is absolutely superior at resisting the torquing moment as there is massively more contact with the stock.
Jimro