stoney1666
Member
i know that the case length is 2.260, but can you go 10 thousandth over and not get in trouble?
223/556?
- Thread starter stoney1666
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Click_Here
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- Oct 19, 2022
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You can go longer as your chamber allows. Just dont expect reliable feeding in an AR Mil-spec magazine.
Cartridge length is 2.26 because that’s all the magazine will allow. If you go over you can’t feed from a standard AR magazine. Results may vary if you’re talking about bolt guns. I’ve seen people post about 2.235” or maybe more but that was out of a bolt action with a magazine that would handle it or single fed.
ArchAngelCD
Member.
As you see it's probably not a good idea. Why are you asking?
Trimming brass is not hard at all and not expensive if you buy one of the less expensive tools.
Soonerpesek
Member
Is OP talking case trim length, or Overall cartridge length….???
Ironicaintit
Member
He said case length, but @ 2.260, he's asking about cartridge length overall
Soonerpesek
Member
Be nice if he showed up again to verify...........
...........'cause he's gettin' answers for both.....Click_Here
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Raise your hand if you've seen a 223/556 case at 2.260 
Ironicaintit
Member
There's two types of people:
1. Those who can extrapolate from incomplete data
2.
1. Those who can extrapolate from incomplete data
2.
MarshallDodge
Member
There are little case length gauges that slip into the mouth of the brass then are inserted into your chamber to find out how long your case can be.
www.brownells.com
Most of the time you will find that the chamber will allow for longer than 1.760"
I trim mine right at 1.760, because why trim more than is needed? I also use a headspace gauge to make sure to only bump the shoulder between .002 and .003" on my semi auto loads. On my bolt action it is between .001 and .002" This keeps brass growth to a minimum.
SINCLAIR INTERNATIONAL Sinclair Chamber Length Gage | Brownells
Check out the SINCLAIR INTERNATIONAL available Online at Brownells Today and many more Case Length Gauges products are available in our Reloading Department.
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Most of the time you will find that the chamber will allow for longer than 1.760"
I trim mine right at 1.760, because why trim more than is needed? I also use a headspace gauge to make sure to only bump the shoulder between .002 and .003" on my semi auto loads. On my bolt action it is between .001 and .002" This keeps brass growth to a minimum.
Soonerpesek
Member
It's also ironic that there are all types of idiots........................................................
2.260 is max per the book, but I have seen hit or miss issues with some mags having issues at that COAL with certain bullets, so I load at 2.255 for long heavy bullets. Mags in question that I tested were Lancers and Magpuls, others may have this issue, YMMV.
I do have some some mags that will allow a 2.310 COAL made by ASC, which I dont think they make anymore. There are some companies out there making long COAL mags, just cant remember the names offhand.
stoney1666
Member
brain fart, meant case length longer then 1.760.
I would not. You will be pushing brass into the throat and cause a dangerous high pressure situation. I trim at 1.750, and I trim every time.
Click_Here
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Max case length is max case length. You don't want to go over that.
Soonerpesek
Member
Glad to see that you know everything
You are sooooooo intelligent…!
MarshallDodge
Member
AR-15 20 Rd .223/5.56 Stainless Steel Magazine
Get your hands on the MOST RELIABLE ar-15 magazines around. If you value quality, reliability, and toughness, our magazines are for you and your rifle.
www.ammosc.com
An email to them confirmed that they are still making them and will accept 2.3" COAL rounds.
The aluminum version are limited to 2.26
AR-15 20 Rd .223/5.56 Stainless Steel Magazine
Get your hands on the MOST RELIABLE ar-15 magazines around. If you value quality, reliability, and toughness, our magazines are for you and your rifle.
An email to them confirmed that they are still making them and will accept 2.3" COAL rounds.
The aluminum version are limited to 2.26
Thats good. I like mine, and they are handy to have on hand.
I bought some SSTL Grendel mags from them as they used be extended COAL, but they are not. Not sure if the newer ones are again.
I wanna say the Duramag SSTL mags are extended COAL, but I could be wrong.
