I'm having a devil of a time srcounging up this information. I think SAAMI changed their website and I have not been able to figure out where this info is located.
I have read several threads on 5.56 vs .223, but have not been able to find an authoritative source on the difference in pressures between the two rounds. I have found folks saying they differed by so much, etc. but without citing any documentation, such as a reloading manual or SAAMI. (They very well may be right, but I prefer solid documentation.)
Basically what I am wanting to know is if anyone has a link to the safely allowable range of pressures (in p.s.i.) for a .223 chamber and the same information for a 5.56 chamber from an authorative source.
Thanks in advance.
PS I should add that the reason I need the information is because I am arguing with someone about how safe it is to fire 5.56 in a .223 chamber and they are insisting that there is no difference between the two rounds. I have told him that there are higher pressures in the 5.56 round and that this is what makes it unasfe to fire 5.56 in a .223 chamber. I need some "proof" to convince him. If it was just some Joe Schmoe, I wouldn't care if they were being blockheaded, but this is a family member, so I have more of a stake in convincing them.