NFIE,
Couldn't agree with you more.
I have found over years of reloading - 60,000 rounds - that deburring inside and outside of my cases eliminates a lot of variance in the cases when loading bullets and makes the brass much smoother as the bullet is seated.
Not being able to use the same pressure on every bullet really causes variations in cartridge base to ogive measurements.
When the cases are deburred, my rounds are all +/- 0.001 inch or better across 25 rounds. (I generally load 25 rounds for each different load that I shoot.)
Without deburring, that different by about 3 times that.
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