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How much to turn necks?

 
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  #8  
Old 06-20-2006, 05:54 PM
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Re: How much to turn necks?

i agree that your chamber is probably 342. if your necks have .015 wall thicknes, your loaded rounds will be around 337-338. that's about .004 clearance with a loaded round. in my opinion that would be close to optimal for a hunting gun.you mentioned .016 for wall thicknes...too tight, only .002 TOTAL clearance. .014 would also work well. you'd size your brass a little more but you could use all of it and never have any "pinching in the neck" worries.
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  #9  
Old 06-20-2006, 06:07 PM
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Re: How much to turn necks?

Not to rain on your parade, but if you have a .342" chamber neck in a factory Remington I'd be surprised. (.3425 is SAAMI minimum spec.) and a .338 loaded round, your at the accepted sporting rifle chamber clearance already. If you cut the neck walls anything under .015 you'll have an undersize round for a factory chamber. I've seen Remington chambers run as high as .3450, the only to know is a chamber cast. Brass spring back cannot be used to figure the case neck size.

Match grade chambers usually like brass .002 under chamber neck size.
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Old 06-20-2006, 06:52 PM
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Re: How much to turn necks?

i'm not sure what you mean but if you're saying that .0045 is considered something around standard clearance, i don't buy it.and if turning to .014 is too much clearance,i respectfully disagree.most factory ammo i've measured is at least .006 and usually more for a loaded round clearance.i think most would consider .004 clearance in the "tight neck" catagory.i do agree that measuring fired brass is not an exact thing for chamber diameter, but it will get you in the ballpark,probably within .001.
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Old 06-20-2006, 07:40 PM
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Re: How much to turn necks?

Harvey Donaldson pioneered the so called tight neck cartridge around 1945 or so, it was carried over the 222 Remington when it came out around 1950 or so. The concept entails cutting a small neck chamber and cutting the case neck to the same size as the chamber neck, thus no clearance. AKA tight neck. The case was then able to be reloaded without using a sizing die.

Using 5 different brands of cases will yield 5 different case neck thickness dimensions. Also the cases will be of different temper or hardness, so they will never be even close as to figuring the chamber neck dimension from a fired case.

Factory ammo also varies in brass thickness, as measured loaded. So, just who is to say what is standard.

.004" will work in a hunting rifle, that's what I use when I can, never had a problem with it either. The more you cut the necks down the sloppier the cartridge fits in the chamber.
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Old 06-20-2006, 08:11 PM
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Re: How much to turn necks?

measuring the neck on a fired case will get you close to the chamber size and more turning of the neck has little to do with how the cartridge fits into the chamber.
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  #13  
Old 06-20-2006, 09:21 PM
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Re: How much to turn necks?

[ QUOTE ]
Harvey Donaldson pioneered the so called tight neck cartridge around 1945 or so, it was carried over the 222 Remington when it came out around 1950 or so. The concept entails cutting a small neck chamber and cutting the case neck to the same size as the chamber neck, thus no clearance. AKA tight neck. The case was then able to be reloaded without using a sizing die.

Using 5 different brands of cases will yield 5 different case neck thickness dimensions. Also the cases will be of different temper or hardness, so they will never be even close as to figuring the chamber neck dimension from a fired case.

Factory ammo also varies in brass thickness, as measured loaded. So, just who is to say what is standard.

.004" will work in a hunting rifle, that's what I use when I can, never had a problem with it either. The more you cut the necks down the sloppier the cartridge fits in the chamber.

[/ QUOTE ]

Well... Saami does... at least to a level of voluntary compliance from all US mfgs. I wasn't talking about .004"... I was talking about .004" more on top of whatever is already there. I do certanly agree that .004" is great for most applications... but you usually have to go to a custom reamer to get it. BR chambers are great for BR guns... but 99.9% of what the folks are shooting on this site is not a BR gun. Fortunately, we can stand a little more change in brass than the BR croud [img]/ubbthreads/images/graemlins/smile.gif[/img]No sizing requires under .001" per side... and closer to .001" total clerance. I personally can't put that much work into all the cases I put through my guns... hundreds of them...
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  #14  
Old 06-21-2006, 04:05 PM
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Re: How much to turn necks?

Guys,

I'm away from my gun for a few days. Took the family to So Cal for a 4 day vacation and hospital visit. Still have internet when were not playing on the beach [img]/ubbthreads/images/graemlins/smile.gif[/img]on puking on the roller coaster. [img]/ubbthreads/images/graemlins/confused.gif[/img]

I'm going to try a little trick of placing a Hornady .350" lead muzzleloder ball just in the mouth of an old case. I'm going to lightly chamber it, not totally, to get the ball to swage down to the chamber neck dimensions. It should either stick in the mouth of the case and extract with it or I can simply pop it out via a cleaning rod.

I'm of the feeling I should get a minimum of .003" or maybe .004" clearance.

.342" minus .308" = .034" (assuming .034" is correct)

.034" minus .003" = .031" /2 = .0155"

or

.034" minus .004" = .030" /2 = .015"

Of course this is all academic until I get back home on Saturday and check the chamber neck diameter.
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