case length ?

[J-cat]

Friend of mine was given box of 5.56 brass that has been sized, trimmed, and primer pocket swaged. Case length measures 1.750. Loading manuals call for 1.760. This brass still good to go? Thanks in advance.

How do you know these have been sized correctly?

[divingin]

No Sir, it is in the proper place re case length. Case length does apply to minimum spec for neck tension and is tied in with how much neck a case has to grab/hold the bullet proper.

No, that's the thing. That "spec" is a guideline. A suggestion. It is not a requirement. You can get adequate neck tension with a very short neck or with very little of the bullet's bearing surface in the case. Neck length has nothing to do with pressure unless it's long enough to prevent the bullet from being released cleanly. Neck length has nothing to do with seating depth until you throw your "spec" about needing a diameters worth of length into the mix.

[AandO]

GEEZ

What do I care if you just cut the neck off and throw in some powder and toss in a bullet to the mix?

I'm merely exploring the minimum safe length for 223 and for myself that has been determined to be 1.35

At what point the true shortest trim level is I care not to explore, 223 brass is expendable to most of us.

That said, go ahead and cut shorter and let us know how your concentricity holds up in cycling your shorties.

[Bumslie]

How do you know these have been sized correctly?

Because his case gauge told him so.

RIP Blitzburgh

[kcstott]

GEEZ

What do I care if you just cut the neck off and throw in some powder and toss in a bullet to the mix?

I'm merely exploring the minimum safe length for 223 and for myself that has been determined to be 1.35

At what point the true shortest trim level is I care not to explore, 223 brass is expendable to most of us.

That said, go ahead and cut shorter and let us know how your concentricity holds up in cycling your shorties.

Because you can't seam to grasp that surface area has near zero to do with friction coefficient and neck tension.

Minimum safe OAL?? how would a cartridge be unsafe if it was super short??
if the bullet is still held by the neck and the load is not compressed it's safe to shoot.

[AandO]

Because you can't seam to grasp that surface area has near zero to do with friction coefficient and neck tension.

Minimum safe OAL?? how would a cartridge be unsafe if it was super short??
if the bullet is still held by the neck and the load is not compressed it's safe to shoot.

GEEZ. I'll not follow up anymore. You seem focused on OAL and other moot issues...

[kcstott]

GEEZ. I'll not follow up anymore. You seem focused on OAL and other moot issues...

Well you made the mountain out of a molehill

[J-cat]

Because his case gauge told him so.

RIP Blitzburgh

Case gauge is not his chamber

[Bumslie]

Case gauge is not his chamber

I was just being facetious with you. Hence the

RIP Blitzburgh

[J-cat]

I got that, just wanted to take the opportunity to point out something people don't care about- headspace.

Semi auto chambers are longer than bolt gun chambers and they stretch the cases more. When you resize a semi auto fired case you are pushing the shoulder back a lot. 223 dies take that into account and allow you to set the shoulder back .006-.008" below zero clearance in some chambers. A 1x case resized in that manner is basically a fire and throw away deal.

OP, if that is your intent, fine. I would check your headspace and shoulder length though.

[smoothy8500]

Going from memory here but I believe I never had to trim that brass....

Interesting that you have never needed to trim 223 /5.56 after resizing.

[smoothy8500]

On a side note, if one is regularly using extremely "short" trimmed 223 at let's say 1.740" (or less), is there a possibility of developing a carbon ring in the neck area that would interfere with a max length 1.760"? Or is the carbon ring normally just develop in the throat?

[kcstott]

On a side note, if one is regularly using extremely "short" trimmed 223 at let's say 1.740" (or less), is there a possibility of developing a carbon ring in the neck area that would interfere with a max length 1.760"? Or is the carbon ring normally just develop in the throat?

Just the same as shooting 38 spc in a mag chamber. Yeah you can develop a carbon ring in the neck area of a chamber by using very short brass

[smoothy8500]

Kind of what I figured.

[J-cat]

Interesting that you have never needed to trim 223 /5.56 after resizing.

In most cases, 1x 556 intended for 2x throwaway does not have have to be trimmed.