Skip to content Skip to footer
Please to create posts and topics.

Trimming 5.56 Once Fired Brass

Hey Fellas,

Just a quick question, or not. I use once fired Lake City brass from a contractors range to reload. When I get the brass the first thing I do is inspected and trim the brass. I trim the brass to 1.750. One of the guys that I shoot with asked me why I do all that trimming. He asked "Have you ever just messured the brass to see what does or does not need to be trimmed?", and then said "If the brass isn't over 1.758 you don't need to trim it." I had just gotten 5000 casings from the range last week. I started going through them today, and I have made my way threw about 1500 of them. Out of 1500 only about 300 to 400 are over 1.758.

Now for that question I was telling you guys about: Do I really need to trim brass if it is under 1.758? I have messured the brass, and then put it through the resizing die. If a casing is 1.758 and then I resize it. It only expands by .001, or not at all. Let me know what you guys think.......

You really need to size some of the cases first, then measure them. It is during the sizing step that cases increase in length. 1.760" is the maximum acceptable case length for a .223 remington casse. If the sized cases are shorter than this, then trimming is not necessary.

Wow, I wish I knew that about 10,000 rounds ago. I have had a lot of wasted time. Thanks for getting back to me.

not a waist of time, you will increase your accuracy by trimming all to the same size and by weighing each case and loading by lot. all depends on if you are plinking or trying for sub MOA.

Personaly I like the uniformity of trimed brass and Ican have it done by the time I measure every case. In my mind uniformity equals accuracy. But that is my two cents only.

By Reloaders, For Reloaders.

Reloader.com © 2026. All rights reserved.

Go to Top
E-mail
Password
Confirm Password