Cartridge neck turning advice

[Henry Shooter]

Good day
I've been reloading for awhile and have good success with it. I want to up my accuracy by turning the necks on 223, 308, and 338.

Is there a minimum neck thickness for specific calipers?
Playing with 223 tonight I'm getting .012 with 99% cut coverage.

I am trying to get as much neck surface cut as possible but I am concerned about cutting too much
Any advice is appreciated

Thanks.

[brando]

This is a good read to get started with neck turning...

http://www.6mmbr.com/neckturningbasics.html

[bsumoba]

usually you want to turn cartridges for a few reasons:

* consistent neck thickness for more even bullet release upon firing.
* you have a tight neck chamber and you need/want more neck clearance
* you are fireforming a round from a parent cartridge like a 284 Shehane from 6.5x284 brass or 7 SAUM from 300 SAUM brass, etc and you need to either turn neck because of bullet point #2 or you need to mitigate donuts (if you do not know what this is, look it up).

that being said, the general consensus is that you want some neck clearance rather than a tight neck chamber. Most cartridges will do well with 0.003-0.007 neck clearance. I am not sure about .223, but in my .338 edge I am running about 0.006/0.007 neck clearance and in my 284 Shehane I have about 0.005/0.006 neck clearance.

i am assuming you know what neck your chamber is. go on accurate shooter and do some searching. there is probably a lot of data there.

[Khromo]

I try to achieve no more than a 50% shave. I think I got that guideline from a G. David Tubb video. If you are using good quality brass that should give you no more than 0.001-0.0015" deviation, on most of your cases. The ones that show more than that (thinner spots on the case necks) can be segregated for offhand practice, fouling shots, etc.

It made a big difference in my group sizes. Probably most of that was minimizing flyers.

[Henry Shooter]

I do appreciate the input. Brando, that's a great site, it answered the question I was looking for.
Again, Thanks guys..

[Fjold]

Neck turning is a pain in the butt. I built a 22.250 with a .250" diameter neck that requires turning all my brass. If you pick up the wrong brass and accidently load a round with it, it will chamber a little tightly but pressure goes through the roof and velocity is awesome.