Whether it is "safe to shoot" or not depends largely on the condition of the gun. Best thing to do is have a gunsmith that knows Parker take a good look at the gun and give you an opinion. Most of us shoot lower pressure loads to extend the life of the gun and to guard against possible problems caused by higher pressures.
Let us know where you live and someone can recommend a 'smith.
Congratulations and good shooting down the road!
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