223 minimum case length

[ronas]

I've read the very recent thread about maximum case length, but what is the minimun length.

I ask because I have brass that has been sized and some are as short as 1.744 and a little shorter.

I also have new brass that I measured at 1.752, with some slightly longer. I wonder if I should trim the new brass so it will all be the same length.

Edited:

The rifle I am reload for is a Colt AR 15.

[r08ert209cali]

http://www.calguns.net/calgunforum/showthread.php?t=95166

[ronas]

http://www.calguns.net/calgunforum/s...ad.php?t=95166

The link you indicated is the one I referenced in post #1. I don't recall any indication in that thread as to minimum length. Did I miss it?

[Rule .308]

Minimum case length is typically .010 under max length. So if your max length is 1.750 then trim them to 1.740

[r08ert209cali]

ar15barrels
Quote:
Originally Posted by rksimple View Post
Not necessarily true. It depends on your chamber. I have a savage 12fv in 223 that has an extratction issue remedied by the use of long cases. How long? I've used cases up to 1.780" in length without any chambering issues and extraction is great. Its all dependant on how your chamber is.
You just hit on something that probably 99% of shooters might never realize.
There are specs on case trim length, and then there are specific dimensions of a particular rifle.
The published specs are simply GUIDELINES that are supposed to be safe in ANY rifle made to the guidelines.
Now, MOST factory chambers will safely take cartridge cases considerably longer than the published specs.
I call these chambers "lawyer approved" as they are made longer to help keep pressures lower.
The unfortunate side-effect is reduced accuracy potential.

Sinclair sells a simple tool to measure YOUR chamber length.
Once you determine what your rifle can take, trim 0.010" to 0.015" shorter and be done with it.
If you have a chamber that's 0.060" longer than spec, I doubt you would ever need to trim your cases before they wear out.

I thought this would help you out.

[r08ert209cali]

Heres another cool link. may have an answer for you.http://www.6mmbr.com/223rem.html
as far as 1.744 your good to go the 1.752 I would trim to 1.750.