What Is The Minumum Neck Wall Thickness of 223

[orangeparkplink]

I purchased a lyman neck turning attachment for my trimmer and started turning cases. Before turning, the neck thickness varied from .010 to .012. In the process of evening out neck thickness, is there a source for the mimum thickness you should cut to for any caliber? Thanks in advance.

 

[MEHavey]

I turn my new cases so that ~1/2 - 2/3rds of the neck surface has been turned down (i.e. the high spots leveled), and the rest stays at original thickness (whatever that turns out to be). That seems to address 90% of any problems and establishes the baseline.

If/when I turn again (6-8 reloads) that baseline thickness is applied again -- even if the entire neck surface now gets relieved a bit.

 

[orangeparkplink]

Once I have a base line, then turn the remainder at that setting. So as long as I do not have any split necks, I should be OK? I just want to make sure. Thanks

 

[MEHavey]

Yes. In my experience unless you are in the 0.1" benchrest game, all you are really after is making the necks initially uniform/leveling the initial high spots. After that it's just occasional maintenance -- sorta like brushing your teeth.

 

[243winxb]

I have seen benchrest shooters use a neck wall thickness as small as .008" But they are using tight neck chambers. On firing the brass only expands .0015" In a factory rifle , my turned neck wall thicknessis is not less than .012"

 

[orangeparkplink]

In this batch I am working on to get them concentric, I would need to get between .010 and .011. These are once fired rems. Not sure if I am cutting too much.

 

[243winxb]

Just checked Federal & PMC reloaded ammo i have, unturned necks in 223 rem. Most measure .246" subtract bullet diameter of .224" gives .022" Divided by 2 = .011" neck wall thickness, unturned. Not much to work with. If loaded round necks were near the.253" SAAMI maximum, you would have something to cut.