What does the manufacturer reccomend? For my Mathews it is 5 grains per inch so for a 70 pound bow that comes to 350 grains. The arrow itself will weigh less than this becaue you have to figure in the broadhead, fletching and nock in the weight.
I think if I remeber right 5 grains per inch is a pretty standard number for all bow makers. I beleive if your arrow weight is under 350 grains tthe bow can explodeon you. I think to keep things safe I would try to get my arrow weight around 420 grains. For one your bow will be just that much quieter. I pull 67 pounds on my Hoyt and my arrows weight 450 grains and it sounds like a truck hitting a wall when the arrows hit their mark.
One of the things I struggle with when afield is keeping my rifle clean and in good working order. Small amounts of dust and dirt collect moisture; moisture can freeze rendering your action immovable when you need it most. I have seen this happen on multiple occasions, and over time, I’ve learned the cause and how to prevent this from happening.
The first thing that you need to avoid before going afield is leaving excess oil on the gun. Oil will trap dirt and sand in all the wrong places....