I trim to 1.745
All my 223/556 cases get trimmed to 223 spec at 1.745 middle of the road. I have a LOT of this type of brass and its such a chore I use a dillon electric trimmer in the xl650 to do them all when the bucket of brass gets close to the top.
What you need to be concerned with is how thick is the web. As you shoot reload time resize and so on the brass you remove comes from somewhere. What I do is sort by headstamp, weigh and segragate into 1 grain of weight difference piles. Take one from the pile with the lightest average weight cut it at the base of the case and examine wall thickness. If it looks thin all of that weight gets recycled.
Its still work but it prevents case head seperation as the brass gets thinner from use
"Gun control: The theory that a woman found dead in an alley, raped and strangled with her panty hose, is somehow morally superior to a woman explaining to police how her attacker got that fatal bullet wound." — L. Neil Smith
The problem with being stupid is you cannot simply decide to stop doing dumb things...
"I crapped my pants to avoid the draft!!" -Ted Nugent