SAAMI 257 Roberts +P
It would be nice to show loads for the SAAMI spec 257 Roberts +P. It is based off a max average pressure of 58K psi as compared to 54K for the standard 257 Bob.
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use the personalized load calculator (https://help.xxlreloading.com/hc/articles/31062312142610) and set the safety buffer to 0. This will get you loads for up to 54k PSI pressure which is 10% below the max pressure for the +P and would be a good starting point. You could then carefully work your way up if you like .