That's true, but in practical terms for the average rifle driver a 0.0022" variation in chamber size is likely going to be less variation than the ammo you can consistently source... Being able to find something that works and retune the ammo you can get in some form stands to be potentially more reliably accurate than relying on chance!
The ultimate out of this would be able to buy a 10,000 bucket bulk pack of soft solid nose and slamming them through a process which gives you reliable hunting ammo to fit a standard sloppy chamber. I suspect that's where the Powerpoint was so reliable, the driving band section was very consistent.
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