hi john......most slow burning powders like 7625 or 800x have very low chamber pressures but may often have large verations in feet per second and are very dirty because of the lite loads to acheve these low psi. they are dirty because they are not ment to be used in very lite loads. they were made to be used in high performance loads and shoot much cleaner when the pressure gos up to the 10,000 psi range. but i would not recomend these type pressures in any of our fine old parkers. i would recomend trying the new winchester AA LITE , burns very clean ,psi in the 5000 psi range. check out there loadingd tables and i think you will be happy and safe.my son and i use this in our twist steel and damascus parkers for skeet and sporting clays
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