I agree with not running these too hot. I have the 6PPC version I picked up in the 80's. Looking at the "dainty" bolt face alone should be warning. Still - these are a sweet, super-accurate factory gun. Good find!I shoot a 22 PPC chambered with an original spec PPC reamer. I am able to use a PPC USA die (Bushing FL) and no turn neck. It is not a PPC USA chamber but the earliest Pindell?Palm reamers let me get away with it.
I have had success using 322 and N133 and 50-52 grain bullets. The SAKO rifles are not as stout as some of the customs, so don't try to run it like a death ray. I use mine (an early 60's Superior custom action for occasional informal shooting and groundhogs. It will lay them down at 500 yards using a 50 grain Vmax.
My best accuracy has happened with Older Sako brass, fed GM primer, H322 and a 52 grain Berger. I have never tried a custom bullet in it.