6BR neck variance

[BenPerfected]

As a competition shooter, if you were targeting your 6BR neck thickness .0011 but some brass measured .00115 would you re-work the brass to get it the same or sort the brass by neck thickness like you might sort bullets by weight? What would be your targeted 6BR target neck thickness assuming a .268 chamber.
Ben

Woops.... Corrected to missing zero

 

[CatShooter]

As a competition shooter, if you were targeting your 6BR neck thickness .0110 but some brass measured .0115 would you re-work the brass get it the same of sort the brass by neck thickness like you might sort bullets by weight? What would be your targeted 6BR target neck thickness assuming a .268 chamber.
Ben

I can live with an 0.0005" variance.

I run a 0.262" neck 6mmBR rifle, and for a while, I was shooting cases that were cut to 0.009", for a total of 0.261" - very close, 0.001" total clearance.

The gun was a real princess - needed cleaning every time I looked at it, groups were good one day and horrid the next. It spent most of it's time collecting dust.

I saw a video series by Jack Nealy, and he suggested having a total clearance of 0.0025" to 0.003". So I cut ten cases and tried it... the the gun just plain purrrrrred.

So I re-neck turned 1050 Lapua cases from 0.009" to 0.0083" and re-annealed them. (That part sucked).

 

[BenPerfected]

As a competition shooter, if you were targeting your 6BR neck thickness .0110 but some brass measured .0115 would you re-work the brass get it the same of sort the brass by neck thickness like you might sort bullets by weight? What would be your targeted 6BR target neck thickness assuming a .268 chamber.
Ben

I can live with an 0.0005" variance.

I run a 0.262" neck 6mmBR rifle, and for a while, I was shooting cases that were cut to 0.009", for a total of 0.261" - very close, 0.001" total clearance.

The gun was a real princess - needed cleaning every time I looked at it, groups were good one day and horrid the next. It spent most of it's time collecting dust.

I saw a video series by Jack Nealy, and he suggested having a total clearance of 0.0025" to 0.003". So I cut ten cases and tried it... the the gun just plain purrrrrred.

So I re-neck turned 1050 Lapua cases from 0.009" to 0.0083" and re-annealed them. (That part sucked).

Cat,
Thanks for you comments. As a guideline, what would be the minimum neck thickness you would recommend for the 6BR? Any different for the Dasher?

 

[CatShooter]

As a competition shooter, if you were targeting your 6BR neck thickness .0110 but some brass measured .0115 would you re-work the brass get it the same of sort the brass by neck thickness like you might sort bullets by weight? What would be your targeted 6BR target neck thickness assuming a .268 chamber.
Ben

I can live with an 0.0005" variance.

I run a 0.262" neck 6mmBR rifle, and for a while, I was shooting cases that were cut to 0.009", for a total of 0.261" - very close, 0.001" total clearance.

The gun was a real princess - needed cleaning every time I looked at it, groups were good one day and horrid the next. It spent most of it's time collecting dust.

I saw a video series by Jack Nealy, and he suggested having a total clearance of 0.0025" to 0.003". So I cut ten cases and tried it... the the gun just plain purrrrrred.

So I re-neck turned 1050 Lapua cases from 0.009" to 0.0083" and re-annealed them. (That part sucked).

Cat,
Thanks for you comments. As a guideline, what would be the minimum neck thickness you would recommend for the 6BR? Any different for the Dasher?

Take your chamber neck (0.268"), subtract .243 = 0.025".

Subtract 0.003" (for your total clearance) = 0.022"

Divide by 2 = 0.011"

Neck walls of 0.011" will give you the needed clearance and be easy to live with. Remember to anneal the necks after you turn them.

 

[joshua43214]

Take your chamber neck (0.268"), subtract .243 = 0.025".

Subtract 0.003" (for your total clearance) = 0.022"

Divide by 2 = 0.011"

Neck walls of 0.011" will give you the needed clearance and be easy to live with. Remember to anneal the necks after you turn them.

^^ this
I just wanted to add that you should check your own barrel and not use the theoretical neck size. There can be a fair bit of variation from one gun smith to the next even if they use the same reamer. 0.268" is only what it is supposed to be, not what it really is.