Staying within SAAMI pressure standards is all wel and good. However, when a cartridge is NOT loaded to it's full potential, then either proper pressure standards to allow reloaders to use that potential should be made available. I can think of three cartridges right now off the top off my head that fall into this category. The 7x57MM Mauser, 8x57MM Mauser as loaded in the US, the .280 Remington and might as well include the 30-06 as well.
I load for all the rounds just mentioned with the exception of the 8x57 Mauser and do get performance well above factory/SAAMI levels. Brass lasts for as long as ten loadings and primer pocket stay tight. Just depends on the brand of brass. I find Winchester to last the longest with Remington close behind but Federal seems to be much softer so does not last as long.
Take the 7x57 for example. It's loaded to 45,000 C.UP./50,000 P.S.I. give or take. A 145 gr. bullet from Winchester does an advertised 2600 FPS. I get 2550 FPS from my 22" Winchester M70 FWT. I shoot the 140 gr. Nosler BT at 2800 FPS from that same rifle. It's about 30 FPS slower in my Ruger #1A but has proven to be a bit too hot for my custom Mauser which has a match grade chamber an barrel. Brass from the first two guns will not chamber in the Mauser. Did a test using data for the 175 gr. RN that the 7x57 made it reputation. Used a load that gave 2300 FPS in the Ruger and FWT. The load was 2410 FPS in the Mauser still with no pressure signs. Same load for all three rifles.
Then there's the .280 Rem. Remington admits it's downloaded for pump and semi-auto rifles. The 150 gr. Corelokt does 2800 FPS from my 24" barrel. My handload with the 150 gr. Nosler LRAB does 3010 FPS. The one box used for the workup to that level has been loaded five time so far and is still going strong and primer pockets still tight.
Well all know about the 30-06 and weak low numbered Springfields so I won't beat that old drun. What I will say is if my Remington M700 Classic in 30-06 was made with lesser strength materials than the same model in the .270. I have to say poppycock! Baloney! BS!
Would not surprise me a bit if the guys doing the load work for the loading manuals have worked up proper moderm pressure loads for their own hunting use. If so, then they're not cheating fair.
One more thing. Anyone that does load past published maximums does so at their own risk. I do it for certain cartridge that I know are deliberately underloaded from the factory and kept down in the manuals for liability purposes. I've been reloading/handloading my own ammo since 1954 and I hope I've learned a few things. I sure as hell do not know everything but I haven't blown a gun up yeet, knock on wood.
Paul B.