With fluid steel barrels I am not concerned with the pressure of factory loads. Recoil is the issue as lighter recoil is more kind to old wood and one's shoulder. A factory load of 1 ounce and 1180 is reasonably soft. Light factory loads however are not usually going to be low pressure as they are designed to cycle semi-auto's. Often they are near SAAMI max. Again nothing to be concerned about with fluid steel provided you have "normal" wall thickness.
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