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.223 does not headspace off the mouth that gets trimmed, but off he shoulder. You can trim once every 5 times if you want, but run risks doing it without checking. I can't imagine trimming to a length of 1.730" thats a pretty extreme trim in my opinion. Trimming to 1.750" is plenty and should allow multiple firings before reaching max, but I usually check.
Brass prep used to be a hassle to me but I now enjoy it along with all of the other steps of reloading. I pretty much do something reloading related daily and sometimes prep for days paying attention to details
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