New reloader here. Successfully loaded 9mm and now moving to .223. Prepping some brass of different headstamps; LC, Rem, PMC. Brass is once fired. Using RCBS die set on a Lee Classic Cast Breach Lock single stage press. Trimming brass with the Lee case length gage. Using the gage, shellholder, cutter and lock stud by hand. My manuals say the trim length is 1.760 for 223 Remington. After trimming, my case lengths are 1.7475 to 1.748. Is this the length I should see or should I see 1.760? What is the tolerance for too short or too long? Should all brass be exactly the same length to proceed with the reloading process?