Sizing .308 Lapua down to 7mm-08. Neck Diameter?

[1791PrecisionArmory]

Hello all! I cannot find any Winchester or Remington 7mm-08 brass so I am making some from a bunch of Lapua 308 I have.

I need to neck turn it down to fit the match chamber.

My question is how much should I turn it down to? Neck diameter in barrel is 0.315, brass currently is 0.315-0.316 when necked down in sizing die.

How much should I take off? I turned a few necks down to 0.310 and loaded a bullet and it chambers just fine at 0.312 when loaded. Is that good or should I take a little bit more off?

Any experienced advice would be greatly appreciated, purpose for rifle is steel silhouette shooting out to 600.

Thanks!

 

[BobinNC]

Once fired 7mm-08 brass for sale here Once Fired Brass For Sale

Midsouth has some 7mm-08 Remington*Unprimed Rifle Brass | MidsouthShootersSupply.com

As does Natchez http://www.natchezss.com/product.cf...ce=pj&utm_medium=affiliate&utm_campaign=43737

Powder Valley also has Nosler 7mm-08 brass Powder Valley, Inc.

Zippo on Win or Rem brand 7mm-08, but at least there is some brass.

 

[JGorski]

I'm sure OP wants to shell out over a buck a piece for 708 brass. Turn it down to 312.

 

[1791PrecisionArmory]

Once fired 7mm-08 brass for sale here Once Fired Brass For Sale

Midsouth has some 7mm-08 Remington*Unprimed Rifle Brass | MidsouthShootersSupply.com

As does Natchez http://www.natchezss.com/product.cf...ce=pj&utm_medium=affiliate&utm_campaign=43737

Powder Valley also has Nosler 7mm-08 brass Powder Valley, Inc.

Zippo on Win or Rem brand 7mm-08, but at least there is some brass.

Thank you for the links, I'm just going to try using the Lapua I have though because I have plenty of it.

 

[rigger]

I've necked down 308 to 7mm08 and down to 243 out of lake city brass, 243 is hardly worth the trouble though.

 

[BobinNC]

I'm sure OP wants to shell out over a buck a piece for 708 brass. Turn it down to 312.

He said he couldn't find any 7mm-08 brass, I guess according to you he meant he could not find any cheap 7mm-08 brass....

 

[JGorski]

He said he couldn't find any 7mm-08 brass, I guess according to you he meant he could not find any cheap 7mm-08 brass....

Indeed.

 

[Niles Coyote]

You want .003 of clearance at a minimum and I’d rather be closer to .005... were it me I’d get some Winchester as you should be good to go without needing to neck turn...

 

[1791PrecisionArmory]

You want .003 of clearance at a minimum and I’d rather be closer to .005... were it me I’d get some Winchester as you should be good to go without needing to neck turn...

Just the info I was looking for, Thanks!