Currently, my face (nearest thing to the pressure containing bit that is attached to me). As I'm quite attached to my face, what I am doing is using a very good systematic approach to loading which hopefully prevents distraction and fluffups and then making sure I use the correct info with the correct bits and inspect and work up each load with brain and care engaged. Using accurate measuring devices and inspection tools combined with knowing what to check for is probably (from my experience anyway) a bit more reliable that estimation of pressures as a slightly different throat combined with a different bullet type and case volume can produce a quite different than expected pressure result. I've had one rifle that was anti-pressure and just generally did not read the loading manuals. Was producing case stamping and signs of pressure only a few grains past start loads, which was - unexpected on an '06 sized case...
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