There are a number of people experiencing sizing issues with the PRC case. When designing a chamber, brass, and resize die there is no one size fits all. We want good hard case brass, but its harder to size. We dont want sloppy chambers either. I have experience with designing reamers with...
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Very common problem
Do some research and you will find more threads like these.
There are a couple solutions, one being use a AW prc reamer to open up the .200 line on a saami chamber.
I have a AW reamer kit I rent out that fixes this. You can ream it out by hand at home pretty easily. Do some research and let me know if you need the kit. Hornady could have saved us all the trouble and adjusted the SAAMI specs for it, but it doesn't affect factory ammo folks so no need to.