I used another one asking the same question and they all told me to toss the brass and go out and buy new brass and different equipment.
You're listening to someone with excess inventory of new .223 brass.
I replaced a Lee trimmer that trimmed cases to 1.740, after trimming at least a 1000 cases before I bothered to measure one.

It took ages to wear that batch out. They worked just fine the whole tome.
Brass that's too long can, and will, sooner or later, be a problem. The worst brass is stuff like .30-30 and .35 Remington that needs a crimp. The longer brass will cause the neck to bulge or collapse when crimped before it becomes an actual hazard. Brass for my .357M/.44M loads that need a good heavy crimp when using lots of W296 needs to be uniform or neck tension is all over the place, and so is accuracy. Many semi autos will not seat over length brass.
I convert pickup brass to other cartridge versions, and the switch often produces brass slightly short by as much as 0.010, or even more. Never a problem, and most of the time it never needs trimming before necks split or primer pockets give out.
If you still feel the need to pitch the short .223 brass, many handloaders will be glad to assist with disposal.
