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Headspacing for 7mm stw?

 
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  #1  
Old 04-24-2010, 02:02 PM
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Location: Odessa, TX
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Headspacing for 7mm stw?

What is the best way to check the headspace when I chamber for the 7mm STW? I was told by a gunsmith that I do not have to set the barrel back, but this is where I get confused. How will I check the headspace since the are both belted mags and would use the same gauge.

Also if anyone has a mag go gauge for sale let me know I need one for another project also.
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Old 04-24-2010, 03:40 PM
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Re: Headspacing for 7mm stw?

Are you asking about re-chambering a 7mm Rem. Mag, to 7mm STW? If this is the case, I would set the barrel back at least a half a turn. When any re-chambering is done the end result would not to have any 'shadows' of the old chamber left in the new chamber. By setting back you would be cutting with all the STW reamer. You didn't mention the maker of this rifle. really need more info for a detailed answer. There's no way around not having a set of gages, IMHO.

Last edited by shortgrass; 04-24-2010 at 03:51 PM.
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Old 04-24-2010, 03:58 PM
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Re: Headspacing for 7mm stw?

The gun right now is a Weatherby Vanguard 7mm rem mag. I was told by two smiths that there is no need to set the barrel back since the STW is biger than the 7mm mag. If I did it this way then the go/no go gauges will not work.

Also I have a go gauge on its way from midway.
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Old 04-24-2010, 08:48 PM
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Re: Headspacing for 7mm stw?

The stw is bigger from the front end of the belt forward. You will get a clean new
cut without setting the barrel back , Just look up the case dimensions for the two
cartridges. As all belted cases they headspace off the belt the first firing and then off
the shoulder if you neck size.
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  #5  
Old 04-24-2010, 08:58 PM
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Re: Headspacing for 7mm stw?

You NEED to set the barrel back, I would suggest a full turn. Right now the GO gauge you ordered WILL "go" in your 7mm Rem Mag. If you do not set the barrel back you will not be able to tell how deep the 7 STW reamer is in the barrel until it is too far and the you will still have to set the barrel back.
The problem is ALL .535 base belted cases headspace off of the belt not the shoulder.
Dave
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  #6  
Old 04-24-2010, 09:06 PM
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Re: Headspacing for 7mm stw?

Thanks for the replies. I am going to set it back now, I just need to decide how much. It will be a 1/4 turn or a full turn.
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  #7  
Old 04-24-2010, 09:12 PM
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Re: Headspacing for 7mm stw?

Quote:
Originally Posted by dirtball View Post
You NEED to set the barrel back, I would suggest a full turn. Right now the GO gauge you ordered WILL "go" in your 7mm Rem Mag. If you do not set the barrel back you will not be able to tell how deep the 7 STW reamer is in the barrel until it is too far and the you will still have to set the barrel back.
The problem is ALL .535 base belted cases headspace off of the belt not the shoulder.
Dave
The stw belt is the same depth of .2200 but the case is .002 wider from in front of the
belt forward. How would He not know?
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