In numerous articles and posts, I've read about SAAMI derating the original pressure spec of old magnum calibers such as the .357 magnum and more recently the .44 magnum. I've provided a sample of such information at the bottom of the post. I have never actually been able to locate this information from an authoritative text (a SAAMI bulletin, reloading manual, encyclopedia of cartridges, etc). A couple questions related to this topic:
Why does SAAMI derate these cartridges?
Does anyone know the timeline of the derating, especially the .357 magnum (I seen mention that it's been derated twice?)?
Would it be foolish to load to previous loading specifications in robust, modern-production weapons such as a GP100 or Marlin 1894?
Here is a sample taken from a post:
"357 Magnum original pressure spec: 47,000 PSI
357 Magnum pressure spec current SAAMI: 35,000 PSI
41 Magnum pressure spec Speer #11: 43,500 CUP
41 Magnum pressure spec current SAAMI: 36,000 PSI (40,000 CUP)
44 Magnum pressure spec Speer #11: 43,500 CUP
44 Magnum pressure spec current SAAMI: 36,000 PSI (40,000 CUP)"
Source:
http://shootersforum.com/showthread.htm?t=30815&mode=threaded
Why does SAAMI derate these cartridges?
Does anyone know the timeline of the derating, especially the .357 magnum (I seen mention that it's been derated twice?)?
Would it be foolish to load to previous loading specifications in robust, modern-production weapons such as a GP100 or Marlin 1894?
Here is a sample taken from a post:
"357 Magnum original pressure spec: 47,000 PSI
357 Magnum pressure spec current SAAMI: 35,000 PSI
41 Magnum pressure spec Speer #11: 43,500 CUP
41 Magnum pressure spec current SAAMI: 36,000 PSI (40,000 CUP)
44 Magnum pressure spec Speer #11: 43,500 CUP
44 Magnum pressure spec current SAAMI: 36,000 PSI (40,000 CUP)"
Source:
http://shootersforum.com/showthread.htm?t=30815&mode=threaded