No turn chamber question

[Aitch]

.284 Win is the caliber. I want a no turn neck in a match chamber. I'll be using 180 gr Bergers and 6.5-.284 Lapua brass. I plan to use neck bushing dies. I've seen reamers cut to various dimensions from .313-.3175. Does it make a difference if one uses the appropriate neck bushing to provide .003 clearance? Suggestions/advice appreciated.

 

[280man]

The easiest way to determine this is to seat a bullet in one of your neck up cases and measure. Add .003-.004 and that's your number

 

[Dusty Stevens]

.320 should do it

 

[tmwinds]

.284 Win is the caliber. I want a no turn neck in a match chamber. I'll be using 180 gr Bergers and 6.5-.284 Lapua brass. I plan to use neck bushing dies. I've seen reamers cut to various dimensions from .313-.3175. Does it make a difference if one uses the appropriate neck bushing to provide .003 clearance? Suggestions/advice appreciated.

You can't use a bushing to provide clearance. The bushing will only provide so called neck tension. Clearance is determined by neck thickness of the brass and diameter of the bullet. If you want .003 clearance on a no turn neck do as Rick said and measure a loaded round before you order your reamer.

 

[mr45man]

measure a loaded/dummy round that you assembled. before you order your reamer and add what ever you want for clearance.

 

[tbeasley]

mr45man said it exactly right

 

[Dusty Stevens]

I think he wants info so he can get goin on his reamer. So the answer hes lookin for (using lapua necked up) can either be answered by the reamer maker- simple enough- or hes just wanting info for his own personal thinkin ahead in which the answer from experience is .320 is a good number. Hope this answered his question simply enough

 

[butchlambert]

I've heard the term "match chamber", what does that mean?

 

[Riesel]

I've heard the term "match chamber", what does that mean?

Hmmmmm.... Good Question !

 

[hogpatrol]

I've heard the term "match chamber", what does that mean?

The opposite of a factory chamber.

 

[joshb]

This might be a serious question,Hog. Let me answer it. I order a reamer and have a gunsmith use it to chamber my barrel. A week later, I send him another barrel with the same reamer so it matches the first barrel. A "match" chamber! Write?

 

[fguffey]

I've heard the term "match chamber", what does that mean?

Butch Lambert, it's in the book. It is not something that can be discussed on a reloading forum because there are so many reloaders that do not believe the old guys could hold clearances that tight/close.

F. Guffey

 

[noload]

.284 Win is the caliber. I want a no turn neck in a match chamber. I'll be using 180 gr Bergers and 6.5-.284 Lapua brass. I plan to use neck bushing dies. I've seen reamers cut to various dimensions from .313-.3175. Does it make a difference if one uses the appropriate neck bushing to provide .003 clearance? Suggestions/advice appreciated.

No It does not make a difference. BUT No turn and .313 does not compute, with a .003 clearance.