Reloading the .308/7.62x51 for the Ishapore 2A1

I vaguely remember reading somewhere that I think it is recommended to keep pressures under 50,000 psi for the Ishapore 2A1, does anyone know anything about his. Also I am trying to decide what bullet size will give the most accurate results in the 2A1 and am considering 150-165 grain sizes. Does anyone have any info on reloading the .308/7.62x51 for the Ishapore 2A1 they can share on the above questions.

Thanks

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