GW Hunter
Well-Known Member
quick question... If a fired case is .315" and a loaded round is .309", is the neck clearance considered .006"? Or would it be .003"? (The dimension on each side of the case to the chamber neck?)
neck clearances
- Thread starter GW Hunter
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Mikecr
Well-Known Member
6.5- 7thou clearance (with case neck spring back from chamber neck)
IMO, very excessive.
IMO, very excessive.
GW Hunter
Well-Known Member
That's what I was worried about. Thanks for the reply. I have a reason to rebarrel now...
GW Hunter
Well-Known Member
Curious how new brass would help?
GW Hunter
Well-Known Member
bigedp51
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- Dec 10, 2010
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Most factory rifle chambers have large neck diameters and why you are better off not using bushing dies that can induce neck runout if the neck is reduced more than .004..
You have no control over how much your necks expand when fired with a factory barrel. And you must size the neck back down to hold a bullet. The only control you do have is how much the die reduces the neck diameter.
Are Your Sizing Dies Overworking Your Rifle Brass?
http://www.massreloading.com/dies_overworking_brass.html
Table 2 - Inside Diameter Measurements for 5 different sizing dies
Forster offers resizing die neck honing to your desired diameter.
You have no control over how much your necks expand when fired with a factory barrel. And you must size the neck back down to hold a bullet. The only control you do have is how much the die reduces the neck diameter.
Are Your Sizing Dies Overworking Your Rifle Brass?
http://www.massreloading.com/dies_overworking_brass.html
Table 2 - Inside Diameter Measurements for 5 different sizing dies
Forster offers resizing die neck honing to your desired diameter.
Just anneal often and you will be fine and your brass will last longer. I like .004 -.005 but .007 is not the end of the world if your happy with the way it shoots
bigbull
Well-Known Member
GW Hunter
Well-Known Member
Most factory rifle chambers have large neck diameters and why you are better off not using bushing dies that can induce neck runout if the neck is reduced more than .004..
You have no control over how much your necks expand when fired with a factory barrel. And you must size the neck back down to hold a bullet. The only control you do have is how much the die reduces the neck diameter.
Are Your Sizing Dies Overworking Your Rifle Brass?
http://www.massreloading.com/dies_overworking_brass.html
Table 2 - Inside Diameter Measurements for 5 different sizing dies
Forster offers resizing die neck honing to your desired diameter.
I'm falling down the rabbit hole again... I had always used an RCBS standard die in 7mm weatherby. A resized and loaded case would be .309". When I went to the bushing die I got a .307" bushing to have .002" tension. The finished product is .309". No different than when I was using the standard die. How would I be better off not using a bushing die? What am I missing?
GW Hunter
Well-Known Member
And now I hit the bottom of the hole.... So is clearance .003" or .006"? I'm back to where I started.
In my opinion bigbull is correct in .003". However, it really is a matter of semantics how you figure it. If you think about it you have a circumference and your clearance is all the way around. Your case doesn't touch on one side and have .006" on the other.......that's how I figure it. Just my two cents.
GW Hunter
Well-Known Member
That was my original thought but when Mikecr responded differently then I expected it started my tumble into the hole. There are guys on here that know way more than I do about this stuff and I but weight on their opinions.
