.308 Neck Clearance

[TimP]

Getting ready to turn the necks of some Lapua .308 brass. The reamer used has a neck diameter of .339. Now I kind of remember reading/hearing a while back that the .308 Win likes more neck clearance than say the .003 I typically use for my 6mm stuff. Any truth to this or is .003 under the loaded round adequate for the .308 Win.

Thanks, TimP

 

[Steve Blair]

I use .0045" in a Ø.337" neck chamber.

 

[TimP]

Sleepygator,

Do you find accuracy better with .0045 neck clearance or are there other reasons.

 

[Steve Blair]

In both .284 Shehane and .308 Win, I got occasional flyers with .0025-.003" clearance. When I went to .004-.0045, the flyers ended. I don't have a theory to explain it. I jump bullets in both calibers.

 

[TimP]

In both .284 Shehane and .308 Win, I got occasional flyers with .0025-.003" clearance. When I went to .004-.0045, the flyers ended. I don't have a theory to explain it. I jump bullets in both calibers.

Thanks for the info Steve.

 

[gsg5pk]

I would stick with .003"

 

[jsthntn247]

My reamer also has a .339 neck. I turned brass to .014 which should give me .003-.004 clearance.