Havent read it that I recall, its just an impression I have got. From reading different articles in other forums .... nothing concrete.
One of the reasons that people wanted SP brass such as Lapua and Starline was so that it would have a longer life, and that means that it should not respond to high pressure by enlarging pockets.
Enlarged primer pockets is therefore a sign of high pressure, that isnt going to show up in SP brass.
Another benefit of SP brass is that it will now also have a thicker base so it wont expand as much and this will mask what would normally be stiff bolt lift.
As the primer has a smaller comparative area it is also less likely to show things like gas leak and primer flow.
All of these signs of excessive pressure will still happen, just at a higher level than what the reloader is used to when using "normal" brass
This is all pure conjecture on my part. Make of it what you will.
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