Originally Posted by Mikecr
You guys are squeezing the brass up like toothpaste, and trimming it away to change your case capacities, and create donuts and runout.
The results of choices you make..
Mike, while this might be one of your favorite axes to grind, for the benefit of all the others who do, here's some realities regarding it.
Many top ranked rifle shooters winning matches and setting records have been doing this very same thing for decades. When done in moderation, the benefits far out weigh an insignificant change in case capacity (after 5 cycles, it may require a 1/18th MOA correction on the sight) but it's never been a concern as far as runout becoming an issue. Such practices have produced test groups in their rifles smaller than current benchrest records.
The folks who do it the most are those few who full length resize fired cases testing match bullets for accuracy at Sierra Bullets' plant in Missouri. The best of those HPMK pills shoot into 1/4 MOA in their 200-yard test range.
While you may regurgitate from mental nausea at the thought of doing what other successful folks have done, that's fine by all of us who do. Take a deep breath, relax and be sure you've enough paper towels and tissues to clean up the mess you make.
Exactly how much case capacity is changed by removing a cartridge brass tube .335" diameter, .010" long with a .013" wall thickness thats removed form a 30 caliber cartridge case that weighs 200 grains? How much of a change in point of impact will that make?