I've not tried the RST #7 shot loads but anything made by RST that I've ever used was first rate.
That said, I shot handloaded 1 1/8 oz nickel plated #7 from (Ballistic Products) @ 1200 fps in a 12 ga for several years as a first bbl load for pheasant (.010" choke). It worked great on crossing & quartering shots where you could get shots into the front of the bird but on straight away birds it lacked penetration resulting in cripples that the dog had to chase down. I went back to the B&P High Pheasant 1 1/16 oz #5 for Pheasant & have stayed with that.
The nickel #7 I had seemed soft to me comparing it to Lawrence Magnum 7 1/2 shot so that might have been part of the problem.
I've shot a few grouse with 1 oz of the same nickel #7 & it worked fine but I could see no advantage over the usual 1 oz # 7 1/2 load
