If you want/need to buy factory shells for hunting then the RST shells will do the job no problem. As you said you don't shoot as many shells in a season.
IMHO you don't need 1 1/8oz of 7 1/2 shot to kill a Grouse. I hunt mainly with small bores using 7/8 or 3/4 oz loads and do just fine with these and #8 shot.
In addition I really don't care what Parker advertised as a serviceable load when their gun left the factory 100 years ago. You gun and it's stock are pushing 100 years old, treat them with respect. When you were a toddler you ate baby food, I would assume you don't eat that any more. Unless your gun has been restocked then give it the respect it deserves and hopefully someone else will still be shooting it in another 100 years.
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There is no hunting like the hunting of man, and those who have hunted armed men long enough and liked it, never care for anything else thereafter...Earnest Hemingway
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