In my 77RS, I have had good luck with 54 grains of Rl15 and the Hornady 200 grain RN. One of the most accurate loads for my Whelen. It's just like a 35 Remington. If sighted 1' high at 100, it will be 5" low at 200 and way down to 20" low at 300. Nice thing, for me at least the POI at 100 is the same for my 225 grain load, although that one has a much flatter trajectory than the lighter load. You can shoot a couple boxes of the lighter load in a tee shirt on a summer afternoon. It is also deadly on groundhogs. This was safe in my gun, can't say whether it would be in yours.
Bfly