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Old 08-17-2011, 12:46 PM  
mohel
 
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Keizer, OR
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Quote:
I believe it was because the orginial H&H cartridge had such a shallow shoulder angle it couldn't headspace off of it.
Headspace confuses me. I'd never heard it used describing a cartridge.

very helpful, thanks.
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Old 08-17-2011, 01:17 PM  
MRB
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Originally Posted by blucher View Post
Headspace confuses me. I'd never heard it used describing a cartridge.
Check this out. Hope this helps with definition.

Firearm Technical Trivia, October 1999
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Old 08-17-2011, 01:50 PM  
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Headspace for a firearm is the distance from the datum point within the chamber to the bolt face. That datum point for a regular bottleneck cartridge is the midpoint of the shoulder. For a belted mag rifle it is the bolt face to the ridge where the belt sits. On handguns it is different. The 45acp for example headspaces off the case mouth as does the 38 super, 9mmL, and many other semi-auto cartridges. That is why when loading a 45acp you can have problems if you over crimp the case mouth. It may allow the cartridge to go too far into the barrel ending in either e CLICK or a BOOM OH SOB MFER because it just blew your hand off.
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Old 08-17-2011, 02:02 PM  
mohel
 
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Keizer, OR
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Originally Posted by MRB View Post
Check this out. Hope this helps with definition.

Firearm Technical Trivia, October 1999
Perfect, it more than merely helps.


I got curious if the prices were holding true in a depressed market and they are a bit lower than usual. One notable exception was this;
OMG!, a BAR-pix416599474.jpg 

OMG!, a BAR-pix201465369.jpg 

OMG!, a BAR-pix883418316.jpg 

OMG!, a BAR-pix968056971.jpg 

OMG!, a BAR-bar-300-winmag-boss.jpg 

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Old 08-17-2011, 03:11 PM  
MRB
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Originally Posted by mrmurdoc34 View Post
Headspace for a firearm is the distance from the datum point within the chamber to the bolt face. That datum point for a regular bottleneck cartridge is the midpoint of the shoulder. For a belted mag rifle it is the bolt face to the ridge where the belt sits. On handguns it is different. The 45acp for example headspaces off the case mouth as does the 38 super, 9mmL, and many other semi-auto cartridges. That is why when loading a 45acp you can have problems if you over crimp the case mouth. It may allow the cartridge to go too far into the barrel ending in either e CLICK or a BOOM OH SOB MFER because it just blew your hand off.
+1000 on that CP!
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