Neck thickness .338 Lapua Magnum

[DeSilva]

Hi

This may be a stupid question but can anyone tell me the minimum safe neck wall thickness for the .338 Lapua Magnum cases. Iv got some once fired and i want to clean them up but make them concentric. These cases are Lapua but it seems the necks are all over the place in thickness before i start.

Many thanks in advance

 

[aloreman]

Re: Neck thickness .338 Lapua Magnum

Personaly i take a measurement of oll the necks all the way around and turn them down to the smallest thickness. I think mine are all turned to 15thou

 

[DeSilva]

Re: Neck thickness .338 Lapua Magnum

ok thnx for the reply

 

[MALLARD]

Re: Neck thickness .338 Lapua Magnum

can you tell us what all over the place means ( in numerical form)

whats your neck thickness now ?

i have turned my BMG cases from .020 to .015 and they have not spilt after more then 5-7 firings. I remmeber i turned my .30 cases from .015 down to .010 , they started cracking , so i turn them down to .012.

how much are you turning your down ?

IMO, if your not using a tight neck chamber , you wont experince any truly significant results from neck turning.

 

[Erthal]

So, what is the "standard" neck dimension for 338 LM ammunition and what is the "standard"chamber neck diameter?

 

[High Binder]

I always neck turn mine to .015"

 

[Erthal]

High Binder

Your 338 is tight neck or standard? What chamber neck diameter are you using?

Tks

 

[ChrisGarrett]

My pre 2006 Lapua and Norma brand brass all miced in at between .0145" and .0150", out of the box--measured at three spots around the neck.

Chris

 

[Erthal]

I am almost ordering one 338 LM, but as this is all new to me, I would like to know more details.



So ,your neck diameter with bullet seated is aprox. .368-.369. But i am curious to know at what kind or reamer are be used to make the chamber. Tight neck, match, standard

What is the neck measurements after firing?

 

[High Binder]

High Binder

Your 338 is tight neck or standard? What chamber neck diameter are you using?

Tks

Whatever Savages come with. I don't do it to fit in the chamber one way or another, I (99% of us too) do it to have consistent neck tension. I'm pretty consistently sub 1/2MOA with 300gr SMKs .03" off with H1000.

 

[farmerbrown]

Hi,

I clean up my necks. Running standard TRG chamber.

Loaded round is .364-.365 and resize with .363 bushing.

From the math, this makes neck about 13-14 thou.

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