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any special tricks to handloading Belted Mags?

 
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  #1  
Old 08-25-2004, 06:38 PM
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Join Date: Jan 2004
Location: Central Pennsylvania
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any special tricks to handloading Belted Mags?

Just came across a 7mm Rem Mag, and plan to handload for it.

this is my first experience handloading for a Belted Magnum, wondering if there is anything special that I should know when buying dies and equipment.

Its a bolt action - is neck sizing only a good option?

any suggestions are appreciated.

Thanks in advance.
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  #2  
Old 08-26-2004, 05:00 AM
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Join Date: Apr 2004
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Re: any special tricks to handloading Belted Mags?

NETT ,
Neck sizing is a good idea as long as you use a proper neck sizing die and your loads aren't so hot that FL sizing is required every shot. Check that fired shells rechamber easily before choosing whether to NS or FLS .
Minimum FL sizing is also o.k. . Start by setting up your FL die so it doesn't quite touch the shellholder and adjust your die down in the press a little at a time until resized cases will rechamber with just a little resistance when lowering the bolt handle .
Many people overdo it when FL sizing belted rounds . This shortens the case from rim to shoulder and causes excess headspace which ultimately results in case head separations . Belted rounds have a bad name because many people size them incorrectly .
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Old 08-26-2004, 12:59 PM
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Re: any special tricks to handloading Belted Mags?

Assuming your loads allow the fired brass to easily rechamber, neck sizing is the way to go. My suggestion is to get set of Lee Delux dies in that cartridge. It will come with a FL size and collet neck sizer.

I use the collet neck sizer for almost everything I shoot and it produces very concentric necks. The FL die will be there if you need to bump the shoulder back as Aussie described.

When the base gets too big to chamber easily, I pitch the brass as head separation WILL happen if excessive sizing is done.

Jerry
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Old 08-27-2004, 07:35 PM
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Re: any special tricks to handloading Belted Mags?

NETT,
Nothing special that I know of. I have a 7mmRM also and use plain ole RCBS FL dies. When working up loads for target shooting I would re-adjust the die to only neck size previously fired brass, but if loads are to be used for deer season then brass was FL resized.
Good luck. Johnny K.
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Old 08-28-2004, 04:43 AM
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Re: any special tricks to handloading Belted Mags?

NETT and JohnnyK ,
Neck sizing with an FLS die can result in headspace problems as normally you will find that body of case will be partially sized even when you back the die off . Can't usually do neck only . That's why we have neck sizing dies .
Have no experience with the 7mm RM specifically but generally not recommended practice .
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  #6  
Old 08-28-2004, 09:52 PM
LB LB is offline
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Re: any special tricks to handloading Belted Mags?

Aussie, would you please explain your response a little more fully?

I use full length dies on Magnum cases, as well as neck size dies. I have also partially full length sized brass without a belt, a number of times.

What I don't understand is how this process can create "headspace" problems, when using brass previously fired in the same rifle?

Thanks. LB
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  #7  
Old 08-30-2004, 08:08 AM
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Join Date: Apr 2004
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Re: any special tricks to handloading Belted Mags?

LB ,
I've not had this problem personally but have read that normally the case walls are slightly reduced in diameter or compressed by the FLS die prior to the die headspace shoulder making contact with the case . As a result of this compression the case is inclined to lengthen from base to shoulder . If the die is not adjusted properly (as happens when using FLS dies to neck size) then the case shoulder is not forced back to it's proper position .
The end result is a case that has longer headspace than it did originally . This of course can make cases hard to chamber until full length sized properly .
If your rifle has a "long" chamber and/or you are using "short" brass (as is often the case when people overdo their full length sizing) you may not ever notice a problem .
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