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Neck Turning Winchester brass (7wsm)

 
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  #1  
Old 01-30-2012, 08:19 AM
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Neck Turning Winchester brass (7wsm)

Im shooting a 7wsm with a neck chamber of 0.320. I have measured all my unfired brass neck wall thickness and have determined in order to get consistent neck wall thickness I need to turn the necks to a wall thickness of 0.0125.

My question is, is the neck chamber too loose (0.320) for this dimension (2 x 0.0125) + 0.284 = 0.309? I had planned on trying one of the three Redding neck bushings of 0.306, 0.307 or 0.308.

Any guidance would greatly be appreciated.
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Old 01-30-2012, 07:38 PM
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Re: Neck Turning Winchester brass (7wsm)

More of a nightmare in reloading than a solution to thickness variance..

What brass is this?
How thick is it?
Who chambered it?

I think it's too much sizing.
The brass will expand to chamber neck and spring back to ~.318". While your bushing selection is good for .309" it's too much bushing sizing -from .318".
The brass will curl in at too high of an angle, leaving necks way overworked(possibly splitting), and undersize of calculated.
Because there is almost no taper in bushings, you wanna be within ~5thou with them.

If this is Win reloading brass, I would think it would be ~15thou thick. If this is the case why not cull the brass with so much variance, instead of turning it all to an undesirable value?
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Old 01-30-2012, 09:52 PM
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Re: Neck Turning Winchester brass (7wsm)

The brass is Winchester.

The rifle is a GA Precision. George uses a reamer with a 0.320 neck. I want to use it as a long range hunting rifle.

I've been in the reloading room and have decided to turn (clean up) the necks to 0.0145".

(2 x 0.0145) + 0.284 = 0.313"
With a 0.320 neck chamber will this be much better? Also would you buy bushings at 0.310, 0.311, and 0.312 to get started?
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Old 01-31-2012, 12:11 PM
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Re: Neck Turning Winchester brass (7wsm)

That's better, but GA Precision needs to purchase a better suited reamer.
They should have accounted for basics in reloading with brass in-hand.

Maybe they figure you'll slop muddy ammo in there, and then toss the brass, or reform it everytime(into something 'similar' to a 7WSM) with a FL die?
Maybe they need to stick with .308...
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Old 01-31-2012, 05:31 PM
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Re: Neck Turning Winchester brass (7wsm)

At .320" that is not a "tight necked chamber"

My 280AI from Hart is .313" and that is not real tight and I turn to ~.0125"



If you get good brass (<.001" thickness variation) and it is <.0165" (.320"-.003" clearance=.317"-.284"=.033"/2=.0165") per side then you don't need to turn. IMO you want your neck brass to expand and be resized the least amount possible.
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Old 02-02-2012, 01:41 PM
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Re: Neck Turning Winchester brass (7wsm)

Quote:
Originally Posted by jcann View Post
Im shooting a 7wsm with a neck chamber of 0.320. I have measured all my unfired brass neck wall thickness and have determined in order to get consistent neck wall thickness I need to turn the necks to a wall thickness of 0.0125.

My question is, is the neck chamber too loose (0.320) for this dimension (2 x 0.0125) + 0.284 = 0.309? I had planned on trying one of the three Redding neck bushings of 0.306, 0.307 or 0.308.

Any guidance would greatly be appreciated.
With all my rifles I usually cast the chamber to see exactly what I am dealing with. That said, I just clean up the neck on my 7 WSM. I'm using Win brass and a .311 button on my FL die. The loaded round comes in with a .315 neck which would be a bit loose in a .320 chamber, but works in my shooter. So just clean up the neck, and use a button that will reduce the neck .004 to .005 and see what happens. BTW, I wouldn't reduce the neck wall thickness to under .010.
db
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  #7  
Old 02-02-2012, 05:29 PM
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Re: Neck Turning Winchester brass (7wsm)

Like I said on the other site, .320 is VERY roomy. If you are going to neck down to .313, you''ll want to consider doing so in 2 stages, as the chances are good you'll induce concentricty problems trying to take it all down in one step.

Plus you are going to work the necks a bunch each time you size the brass, you'll want to anneal that brass every other time you fire it (no more than every three) or it will split on you fairly fast.

Jeffvn
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