BlR bolts rotate like a bolt action. Regular levers come straight back, not sure how that could "torque' anything. Rear locking bolts allow more case stretch, more so in higher pressure cartridges. if the fired case is not relaxing enough to easily be pulled from the chamber, something is amiss.
And yes, straight walled pistol cases can stretch in lever actions, when loaded to full power. Best not to mix them with revolver fired loads if ya can avoid it.
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