Interesting observations. My current experiments with cartridges that run both sizes have left me scratching my head. In 224 Valkyrie and 6.8SPC I have brass with both sizes. Using 224V Starline brass with smalls I can get ejector swipes and cratered primers in a Savage action at moderate pressures, and it's pretty similar in the 6.8SPC with LRP brass. But in a 6mmARC on a Savage action of the same era (so presumably similar tolerances), it will run tremendous pressures (like well above safe and sensible) without any pressure signs from either brass or primer.
Bookmarks