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7mm Rem Mag Bushing Question

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  #1  
Unread 10-06-2011, 08:25 PM
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7mm Rem Mag Bushing Question

I just spent several hours on the reloading bench and realized as I was about to seat my first bullet (175 SMK) that the neck was to large to put proper tension on the bullet. I'm using Redding Competition Dies and when I used the full length die it odviously expanded the neck. The Comp Dies did not come with any bushings, just said sold seperately. What size bushing do I need since I'm using a minimum spec 7mag chamber?
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  •   #2  
    Unread 10-06-2011, 09:03 PM
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    Re: 7mm Rem Mag Bushing Question

    I shoot a 7mm also. As we know the 7mm is .284 caliber. Try going with a .282 bushing so your 2 thou smaller and see how the tension feels.
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      #3  
    Unread 10-06-2011, 09:04 PM
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    Re: 7mm Rem Mag Bushing Question

    You need to measure the neck of a loaded round with the same brass mfg. that you will be reloading . Take that measurement and subtract .002" to .003" and get the size bushing.

    Jeff
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      #4  
    Unread 10-06-2011, 09:07 PM
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    Re: 7mm Rem Mag Bushing Question

    Quote:
    Originally Posted by Darcey View Post
    I shoot a 7mm also. As we know the 7mm is .284 caliber. Try going with a .282 bushing so your 2 thou smaller and see how the tension feels.

    This is incorrect. You have to take in consideration the thickness of the brass also. The correct bushing will be .284 + (case neckness x 2) - .002"

    Jeff
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      #5  
    Unread 10-06-2011, 09:13 PM
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    Re: 7mm Rem Mag Bushing Question

    Broz,

    I appreciate the input. The bushings range from .306-.314 and I have heard of this method from Reddings site, but with so many options I just wanted to know for sure before I order. Would it be better to subtract .002 or .003, I'm looking for best accuracy as this is a custom rifle that I will be shooting 1500 plus yards?
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      #6  
    Unread 10-06-2011, 09:19 PM
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    Re: 7mm Rem Mag Bushing Question

    Quote:
    Originally Posted by Special Delivery View Post
    Broz,

    I appreciate the input. The bushings range from .306-.314 and I have heard of this method from Reddings site, but with so many options I just wanted to know for sure before I order. Would it be better to subtract .002 or .003, I'm looking for best accuracy as this is a custom rifle that I will be shooting 1500 plus yards?
    To be honest, if you only order 1 bushing I would order the -.003" Reason is sometimes when I order a -.002" and if the brass is not really consistant on thickness I get a few that feel looser. For a hunting load a bit more tension is good insurance. But if you want to do some testing order a few sizes and test a bit. Or get the -.003 and see what you end up with.

    Jeff
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      #7  
    Unread 10-06-2011, 09:28 PM
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    Re: 7mm Rem Mag Bushing Question

    Quote:
    Originally Posted by Broz View Post
    This is incorrect. You have to take in consideration the thickness of the brass also. The correct bushing will be .284 + (case neckness x 2) - .002"

    Jeff
    Thanx for correcting me. Totally had a brain fart. I know better. Don't want to steer anyone wrong.
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