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Reloading Techniques For Reloading


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Do I need to neck turn?

 
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  #50  
Old 06-22-2013, 08:27 PM
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Re: Do I need to neck turn?

New thread started regarding these primer issues:

Primer Ignition Starts Bullets Moving?
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  #51  
Old 06-23-2013, 08:14 AM
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Location: Champaign, IL
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Re: Do I need to neck turn?

Quote:
Originally Posted by Bart B View Post
New thread started regarding these primer issues:

Primer Ignition Starts Bullets Moving?
Thanks Bart B. I saved that bookmark.
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  #52  
Old 04-21-2014, 11:27 AM
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Re: Do I need to neck turn?

Quote:
Originally Posted by Bart B View Post

Info from another forum on this subject.......

A fellow who had participated in the HP White tests in the 1970's said they'd found bullets didn't start moving until about 10,000 psi. QuickLOAD thinks it's more like 3600 psi. Force on the bullet's equall to pressure in psi times cross sectional area of the bullet. Pressure increase partly stalls as the volume expands as the bullet slips from case neck to throat. There's at least one plot in the 1965 Lloyd Brownell study (link below) showing pressure flats at around 12,000 psi. So this can vary.
I'm a little surprised bullet weight isn't included in the calculation.

Spencer
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  #53  
Old 04-21-2014, 11:46 AM
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Re: Do I need to neck turn?

Quote:
Originally Posted by Truc View Post
it has been proven that with only the primer ignited and before the powder lights the bullet is already moving, that is why the small primer is used in Benchrest (205 Federal shoots better because it don't move the bullet) very little flame.
While common with handgun cartridges (in my own tests), larger volume rifle cases oft times will let the bullet stay in place held by the case neck.

How else would my 20 some odd rounds of 7.62 NATO ammo without powder and 190-gr. bullets come back out of the chamber and the bullet had not moved forward one bit? Those bullets needed about 25 pounds of pulling force to dislodge them from the case mouth.
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