If you are looking at 12 ga loads there are many on the Hogdon site that are 1 or 1 1/8 oz loads at 2 3/4 or 3 dre and that produce 1150 to 1200 fps. These produce pressures within factory working pressures for which the gun was made.
Look at the pressure tables in TPS. Also look at the chamber dimensions in TPS. Most Parker 12s were not 2 1/2 chambers.
There are many commercial loads as well as handloads that fall well under the 10,500 psi working pressure and well under Parker proof loads. A person can always choose to use low pressure or low recoil loads but Parkers are sturdily made,not delicate.
I do not know where a person would get an idea that Parker loads need to be kept under 5000psi unless he has a gun that is somehow compromised, and if that is the case I suggest it should not be shot at all.
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