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Neck sizing question...

 
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  #1  
Old 07-17-2014, 10:31 PM
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Neck sizing question...

My fired brass is .310 and needs to be resized to .303 or .304....is that ok to do in one step (Redding bushing neck sizing die), or do I need to hit it thru another size, maybe .306 or .307 first?

This is for Nosler brass for 270 win.
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Old 07-17-2014, 10:55 PM
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Re: Neck sizing question...

Quote:
Originally Posted by The Oregonian View Post
My fired brass is .310 and needs to be resized to .303 or .304....is that ok to do in one step (Redding bushing neck sizing die), or do I need to hit it thru another size, maybe .306 or .307 first?

This is for Nosler brass for 270 win.
Yep.
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Old 07-18-2014, 12:44 AM
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Re: Neck sizing question...

Can you clarify? Yep, it is ok to do it in one step, or yep, I need to hit it thru another bushing to do it in two steps?

Thx.
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Old 07-18-2014, 04:05 AM
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Re: Neck sizing question...

Squeezing the neck down .006 or more in one pass might work, but it puts added stress on the brass. Better to go down .002 - .003" at a tim4e.
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Old 07-18-2014, 08:54 AM
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Re: Neck sizing question...

Gene's right that excess sizing is bad for the necks, but then you might not have a choice.
Doing it in one step is really challenging to necks. Eventually they're not going to take it anymore.
~5thou is about as much as bushings are predictable with.
It can be done in one step but the sizing will be more than stamped on the bushing because you end up rolling brass inward instead of sizing inward(due to excess angles).
So it will be either trial & error to nail it, or 2-stage sizing.

If you're stuck with this situation and single stage sizing, you should look into an annealing machine.
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Old 07-18-2014, 01:06 PM
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Re: Neck sizing question...

Interesting question is why the need to go to .304 in the first place.

sounds like you have overly thin neck turned brass and are trying to compensate for it.

Have you neck turned your brass down to .0125-.013 or so?

Most factory brass is in the .014-.015 range or even thicker, which loaded would put the round at approx .307 and if the fired is .310 your chamber neck is probably .310-.311 range.

With those wide variances you are going to work harden and split the necks.
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  #7  
Old 07-18-2014, 01:39 PM
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Re: Neck sizing question...

New to reloading here...got my equipment and just digging in for the first time. I have an off the shelf A-bolt stainless stalker in 270 win. I am not turning necks yet - i am playing with it with a few cases that I won't use, but I think I need to get the basics down before I throw more variables (and more room for error) into the mix.

I have a 150 or so Nosler once fired cases (from factory ammo) and also bought 50 new brass so I can measure and compare if needed.

On the Nosler reloading data they show a loaded cartridge having a neck diameter of .308, which allows for .0155 neck thickness.

Measuring loaded factory Nosler ammo has diameter or .305 which would allow for neck thickness of .014...Most of my cases have a neck thickness of between .014 to .015 (both once fired and new a Nosler brass).

Based on that, I ordered .303 and .304, as well as .305, .306 and .307 to do a two step and have more flexibility on exact sizing. I arrived at that by taking .305 - .277 to get to .028, which has neck thickness of .014, and subtracted .001 and .002 to get .303 and .304.

Anything wrong with my approach?

Thx

Tom
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