Bushing size

[paulT]

anyone using 338-339 redding neck size titanium bushings with Lapua brass and the berger 185g molly VLDs for their 308, Tried using 335-336 bushings which seems to be tad tight when seating and accuracy not great however when i use 272 Ti bushing with 105g berger &lapua 243 brass which is very light neck tension accuracy is outstanding which seems to suggest light neck tension with berger molly vlds way to go.

 

[markm87]

.337 is what I run with .308 using Lapua brass. Bullet seating feel on the press is just right.

 

[paulT]

Are you using the 337 bushing with molly vlds and ifso what amount of neck tension, Thanks.

 

[markm87]

No molys. I'll have to check the tension tonight.... I think I'm getting .002... but I usually only check it when the feel is too much or not enough.

 

[paulT]

Thanks, markm87.

 

[46490]

What size bushing for 308 Lake City brass? Is there a recommended neck wall thickness that I can plug into the math equation to determine the correct bushing size. I will be using Sierra 168 Matchking's and shooting 100 to 300 yard matches and the occasional 1000 yard Milk Jug Challenge. The rifle is a Savage model 10 (1-10 twist) 24" heavy barrel. Any suggestions are appreciated.

 

[Bill Norris]

anyone using 338-339 redding neck size titanium bushings with Lapua brass and the berger 185g molly VLDs for their 308, Tried using 335-336 bushings which seems to be tad tight when seating and accuracy not great however when i use 272 Ti bushing with 105g berger &lapua 243 brass which is very light neck tension accuracy is outstanding which seems to suggest light neck tension with berger molly vlds way to go.

I run a .336 Redding Tin bushing with Lapua brass but I did a slight turn clean-up down to .014 neck thickness.

 

[fkimble@charter.net]

46490, what are your chamber dimensions?

Frank

 

[rijndael]

What size bushing for 308 Lake City brass?

I used a .334" bushing with LC brass.

 

[Bc'z]

I run a .332 lapua brass necks turned down to .013, loaded round is .334 giving me .003 clearance all the way around.
Wilson bushing

 

[INTJ]

I run a .331 Redding TI with .014" neck walls. Berger 215 and about .0045" of neck tension.

 

[divingin]

What size bushing for 308 Lake City brass? Is there a recommended neck wall thickness that I can plug into the math equation to determine the correct bushing size.

Bullet diameter + 2(neck wall thickness) - .002ish

So if you have a .014 neck wall: .308 + .014 + .014 - .002 = .334

Go smaller for more interference fit, larger for less.


Alternatively, simply measure a loaded round at the neck (which will be bullet + 2neckthickness), and subtract a couple thousandths.