Problems loading 5.56 - Page 2

Black Dog · May 26, 2010, 12:37 PM

Unclenick

I may be misinterpreting your post above, but it seems your saying it`s OK to use Mil Surplus 5.56 in a bolt rifle chambered for .223 Remington ?

As example an SS 109 5.56 in a Remington 700 chambered in 223.

The past received wisdom was not only is the brass sized different but the chambers are different and 5.56 are loaded to a significantly higher pressure then commercial loads.

Lavid2002 · May 26, 2010, 12:45 PM

You got it right, except the dimensions are minimal, as are the SAAMI specs for pressure. The method of testing the pressure is questionable as they are comparing 2 different methods (As unclenick pointed out)

wncchester · May 26, 2010, 01:56 PM

Nick, I've wanted to address the body of error about the supposed differences between .223/5.56 but I just refused to type that much to do it!

Seems many of us take something moderatly justified at best and build a edifice around it but without a shred of justification to support it other than expert quotes from the "Book of Opinions".

GI ammo has crimped primers to hold them in place during full auto fire where the bolt opens when chamber pressures are still high, not because of the pressures per se. Any primer pocket that expands due to excess chamber pressure sure won't be saved by a crimp primer.

Primer crimping has no useful application in sporter bolt or semiauto rifles.

May 26, 2010, 12:45 PM	#27
Lavid2002 Senior Member Join Date: April 6, 2007 Posts: 2,568	You got it right, except the dimensions are minimal, as are the SAAMI specs for pressure. The method of testing the pressure is questionable as they are comparing 2 different methods (As unclenick pointed out) __________________ Math>Grammar

May 26, 2010, 12:37 PM	#26
Black Dog Member Join Date: March 16, 2010 Posts: 23	Unclenick I may be misinterpreting your post above, but it seems your saying it`s OK to use Mil Surplus 5.56 in a bolt rifle chambered for .223 Remington ? As example an SS 109 5.56 in a Remington 700 chambered in 223. The past received wisdom was not only is the brass sized different but the chambers are different and 5.56 are loaded to a significantly higher pressure then commercial loads.

May 26, 2010, 01:56 PM	#28
wncchester Senior Member Join Date: December 1, 2002 Posts: 2,832	Nick, I've wanted to address the body of error about the supposed differences between .223/5.56 but I just refused to type that much to do it! Seems many of us take something moderatly justified at best and build a edifice around it but without a shred of justification to support it other than expert quotes from the "Book of Opinions". GI ammo has crimped primers to hold them in place during full auto fire where the bolt opens when chamber pressures are still high, not because of the pressures per se. Any primer pocket that expands due to excess chamber pressure sure won't be saved by a crimp primer. Primer crimping has no useful application in sporter bolt or semiauto rifles.