Originally Posted by Mikecr
While Larger magnum cases present more volume to vary(regardless of case weight), they have a much wider pressure peak(the part affected by initial containment).
Small underbore cartridges(like a 6ppc, or 30br) can work around capacity variances through sheer extreme pressure loads.
Both of which put affects to peak pressure, and barrel timing -from capacity variance, in smaller percentage.
But mid-size cartridges(like mine) can't work around capacity variances, and I believe they are affected most by it.
That's why I check it.
What's the point where a cartridge size changes from underbore to "atbore" (if there is such a thing) then to overbore?
What's the difference in shot hole positions vertically at longer ranges you see caused by mid-size cartridges that can't work around capacity variances? Or, what down range tests have you made to show the effect at the target and what were the results?