Home Forums Hunting & Shooting Ask The Gunwriters So just who is SAAMI anyway?

Some of the current post here have me asking, just who, what, where, and how is SAAMI?
I know its stands for Sporting Arms and Ammunition Institute. That they recomend Maximum Average Pressures (PSI).
But who are these guys? How do they come up with the
figures or numbers that they do. Do they cut back room deals, or, or, and or what?
We say, "Well SAAMI says this", but with what if any authority? When I say authority not just governmental, but how do they back up or determine how a cartridge should be rated.
We play by these rules handed down to us, how do these rules come into existance?

NOTE some of the following PSI ratings for cartridges.

222 Remington 50,000
223 Remington 55,000 5,000 difference

243 Winchester 60,000
6mm Remington 65,000 5,000 difference

(06 class cartridges)
25-06 Remington 63,000
270 Winchester 65,000
280 Remington 60,000
30-06 Springfield 60,000
The 280 has a larger bore than the 270 but a lesser PSI rating than the 270, The 270 is used in pump and auto loaders like the 280. How does
a 1925 (270) round get 65,000 and a 1958 (280) round get 60,000? How and why was the determination?

(08 class cartridges)
260 Remington 60,000
7mm-08 Remington 61,000
308 Winchester 62,000

(WSM class of cartridges)
270 WSM 65,000
7MM WSM 65,000
300 WSM 65,000
All differ calibers but the same PSI rating. Their hulls
are all based on the same case, just as the 06s are
or the 08s are.

Now, how come, or why doesnt (all) the 06 or 08 class of cartriges have the same PSI rating as (all) the WSM class?
Also why are they, the 08 class at 62,000 PSI and not 65,000 like the WSM class?

?