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Need some help with headspacing for a .300 WBY Mag.

 
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  #1  
Old 06-11-2009, 03:52 PM
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Location: Prince George, British Columbia, Canada
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Need some help with headspacing for a .300 WBY Mag.

I have been doing some research, but still am not quite sure I understand headspacing. I have a .300WBY mag, and would like to make sure my brass lasts as long as possible. Can anyone give pass on some of their wisdom, and at very least give me a few tips on how to take measurements for resizing, in order to make my brass last longer. As well as make my rifle a more consistent shooter.

Thank you for any input you may have.......
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Old 06-11-2009, 05:18 PM
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Re: Need some help with headspacing for a .300 WBY Mag.

here is what I do,
in a 300 wea. mag, I'd either punch a 32 or 338 cal expander ball down in a fired case, then start with my die up higher than it needs to be and start resizing a well lubed case, screwing the die down as I went and closely watch the progress, when it gets close start trying it in the chamber, when the bolt will close with just a bit of resistance. screw the die down 1/16th to 1/8th turn and lock it down. the die is set for minimal headspace in your chamber.
RR
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Old 06-11-2009, 05:41 PM
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Re: Need some help with headspacing for a .300 WBY Mag.

Using the chamber itself as a sizing gage is perhaps the best and certainly the cheapest way to properly set a sizer. Basically the way Ridge suggests, but ... the total range of "normal" headspace, minimum to maximum, is something like .007". One eight turn of a size die moves it almost exactly .0089", about 2 full thou over the total headspace allowance. That's too much!

Suggest that once you get any sizer close limit your adjustments to one sixteenth turn (4.5 thou). Preferably a bit less if you really want the cases to fit without stretching when fired.
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Old 06-11-2009, 05:49 PM
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Re: Need some help with headspacing for a .300 WBY Mag.

Headspacing on belted magnums can be a bit confusing. You will see many manuals list headspace on a magnum case as the distance from the top of the belt to the bottom of the case. However past experience has shown me that even with that measurement within specs, a cartridge may not chamber properly, be tight, or not at all. Reason being is that the brass may be too long at the measurment of the bottom of the case to a point on the shoulder, ie it has streached or the chamber is cut wrong. Essentially that distance is the same measurement as a headspace measurement on a non-belted case. I hope that wasnt too confusing.
How to measure it: I recommend the hornady lock-n-load headspcae gauge. It is a little collar set up you attach to your caliper and measure from the base of the shell to the shoulder. RCBS makes a tool for measuring headspace but is cartridge specific and more expensive than the Hornady outfit. Plus the hornady tool you can read hundreds of different calibers.
Once you determine your HS most guys that do FL size recommend bumping the shoulder back about .001", so it just barely fits the chamber. Myself I try and neck size as much as possible.
If you are intrested in extending case life have you thought about Annealing? Many many shooters anneal becasue they believe (myself included) it greatly extends case life and improves accuracy becasue of mosre consistent neck tensions. Buffalo Bob has a real decent video on how to do it if your interested.
Anyhow I hope that helped some.
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Old 06-11-2009, 05:57 PM
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Re: Need some help with headspacing for a .300 WBY Mag.

How can you measure or adjust headspace on a double radius shoulder?
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Old 06-11-2009, 10:03 PM
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Re: Need some help with headspacing for a .300 WBY Mag.

Quote:
Originally Posted by NorthernWeatherby View Post
I have been doing some research, but still am not quite sure I understand headspacing. I have a .300WBY mag, and would like to make sure my brass lasts as long as possible. Can anyone give pass on some of their wisdom, and at very least give me a few tips on how to take measurements for resizing, in order to make my brass last longer. As well as make my rifle a more consistent shooter.

Thank you for any input you may have.......
I subscribe to the KISS philosophy and on a belted case the best way I know to make the
brass last and minimise head space is to fire the round once and neck size only from then
on until they start getting hard to chamber.

Your brass fits the chamber perfect and doesn't have to be re sized until it gets hard to
chamber. Also head space is .0000 unless you size it and bump the shoulder. there is no
reason to work your brass each time you size as long as it will chamber.

Weatherbys have lots of free bore and this definitely improves there accuracy.

J E CUSTOM
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  #7  
Old 06-11-2009, 10:42 PM
brassprep
 
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Re: Need some help with headspacing for a .300 WBY Mag.

I agree with most of what has been posted here, however; most brass that has a neck, will not be "chamber perfect" until at least two firings. Brass has spring back. Before you settle on a true headspace (as this is the question here), fire x amount of rounds once and x twice (utilizing the already mentioned 'chamber as gauge' method) you will find that upon the second firing, you'll be much closer to real chamber size. Some HP 308 shooters believe it takes 3x to fully settle fit.
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