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I think from what I can gather it stands for the small arms ammunition factory who made the cartridge. It was apparently an Australian firm. If you look at the cartridge head on some 223 brass it will carry a stamp of LC. The manufacturer was Lake City and so on. You find REM, WIN, and others. NORMA comes to mind. Different brass wears differently than others. It can vary from one batch to the next by the same manufacturer. If you reload and shoot a lot and lean toward the hotter loads. It pays to inspect it closely between each loading. Be safe hope this helped some.

I goofed in my description.

at the link provided under Denomination of Cartridges

Two headings
Denomination / Alias

17 Remington 17 AMA
SAA 0145

To my knowledge there is no known Cartridge Headstamp with the letters SAA

As a former hand-loader for 25-06, 30-06 and 35 Whelen (HINT they all use the same brass.) I loaded for bolt action rifles only. When I achieved a crack of approx. 1/4 plus, is when I'd stop using that individual casing. (average 20-25 reloads per casing) I'd mostly would only neck re-size the cases, unless I was changing the size say from 30-06 down to a 25-06. 30-06 was my most available CHEAPEST cases. To one and all if your not familiar with the 35 Whelen, it is a poor-man's 375-H & H. More then ample to take ANYTHING IN SIZE in the United States has to offer. After all, it was designed for African hunts. For the first hundred yards, the ballistics of a 35 Whelen & 375-H & H are the same. :-) When I was loading the 35 Whelen, it was a "Wildcatters" rifle, meaning you had no choice, (late 1960's early 1970's up till the 1990's I believe) either hand load for it, or it sat on the proverbial shelf. Now, you can purchase ammo for it. Remember, no matter what you shoot, it start's with a "CONTROLLED EXPLOSION."