[4runnerman]

Hello Bob. Say 223 i am very familiar with.(my favorite rifle). I trim mine to 1.753. Seems to work very well. Check your rifle for what it likes. I trimmed muliple cases from 1.750 to 1.759 all in .001 incriments and found that mine liked 1.753 the best. Chamering will take some off the length ,but very minimal. What rifle ya got?.