Low Pressure/low velocity is an opinion recommendation and is not based in the Parker documents. Some Parker listed loads are pretty stout, stouter than I care to shoot on any frequent basis.
For example, almost all the Parker 12ga's were patterned with a 1 1/8 oz 3 dre load, which provides about a 1200 fps speed. That is a standard loading for pattern efficiency/distance and lead. Patterning tags provide this information. Heavier loads are listed in other Parker sources as are mean maximum working pressures in psi, which became the SAAMI standards when the Small Arms and Ammunition Manufacturers Institute was formed. Parker maximum loads were SAAMI maximum loads.
While shooting less than maximum loads makes much sense, it is not a requirement for a Parker in good condition. Parkers are not delicate and were not designed to underperform.
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