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When I started handloading I got an RCBS rockchucker press kit that came with an RCBS case trimmer.
I was resizing .223 and 308 by having the die touch the shell holder [ lots of should push back, for those in Rio Linda].
That is enough to make anyone quit reloading, let alone trimming.
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Then I put an RCBS Pro 3-way cutter in a vertical mill and a Lee Lock stud in the mill vise, pair of long nosed vise grips were used to turn the Lee shell holder like a handle. I could trim, inside chamfer, and outside chamfer in 5 to 10 seconds per round.
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I now collet neck size where possible, and if I have to push a shoulder back, I do the absolute minimum I can get away with.
The higher the pressure, the more a case shrinks when fired, and them more it grows when the shoulder is pushed back by a full length sizer die.
I have fired 223 at 66kpsi for 20 times without trimming.
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Then there is always being lazy and just buying new brass, but you may still have to chamfer the inside of the neck.
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