243 wssm neck tension

[bench]

Hello everyone,
New to this forum and thought this would be the best place to get an answer to this question.
In my 243wssm AR what would you think would be a good neck tension,I would like to get a reamer for the ID of the necks to get a more uniform neck tension.
I am using new federal brass and neck thickness is running at .0195 to .020
Also do you think I should turn the OD of the neck a little bit to uniform the OD. or just stick with a reamer.
Thanks
Bench

 

[bench]

Also my necks of loaded ammo on the OD measure .282 on the top edge but near the shoulder at the bottom of the neck they measure .285 to .286.
So my necks are getting larger near the shoulder,so would this be a good thing to turn these necks.
I see alot of info about bolt guns but have not seen any info on the AR platform about neck turning or reaming.
Need help fellas.

Bench

 

[amamnn]

I've been turning mine to .017 for use in my AR. I am going to try .015 next, as I am still not getting a good seal with these heavy neckwalls.
I am shooting a very light (for the cartridge) bullet and load through a 1/14 barrel, so my application may not yield much usable info if you are shooting heavier loads............

 

[mbkmkk]

Annealing has helped the thick necks seal on my 243WSSM brass, both in AR's and a Custom Bolt gun.

 

[bench]

amamnn
I shoot 70gr blitzking and 85gr nozler partition and yes with the thick necks I get quite a bit of soot in the chamber.


mbkmkk
annealing should help but with new brass I still get a lot of soot in the chamber.

I would like to turn the brass to get rid of the taper in the necks??
All my necks are larger at the shoulder then the case mouths.

 

[amamnn]

If you have a direct gas impingement action, you will be getting a lot of soot in the chamber anyway. Still it would be nice to seal the neck for more efficient ignition. I thought that maybe my Oly Arms chamber was a little to generous, but when I switched to a Shilen select match (for this and other reasons) the necks still did not seal annealed or not. Since there is going to be a very short time when the neck IS sealed and the gasses are going to dirty up the neck so that the lug marks won't be readable anyway, the only way I know mine are not sealing is that I can resize my cases leaving the bushing out of my S die and get the same neck OD and neck tension every time. That's a pretty good clue.
I'm getting to the point where I am not even so much concerned with the seal as I am with the release of the bullet, since .243 + .015 +.015 = .273" for the final neck OD. This in a chamber that easily accepts a .282" OD does not bode well for a good seal.

 

[bench]

I totally agree with the neck seal,soot will always be a problem that I feel can not be fixed eaisly.
My chamber neck deminsion is .287
I am going to turn the necks to .019
243+.019+.019=.281
My main goal is not to stop the soot but to try to stop an occasional flyer which I feel is comming from brass that is not consistant.

 

[Nomad47]

You aren't turning much so you should be OK. But if the necks are turned a lot, then the brass has to expand more to make the seal. And more expansion equals more work on the brass, hardening it more.