5-10# in my opinion. 5# if you feel you are in good control of your hunting bow, 10# if you are struggling at full draw with your hunting bow. It should be a weight you can hold at full draw for 10-15 seconds without starting to shake. I don't think it will affect your muscle strength much, because you will probably be shooting a lot more arrows than you normally do with your hunting bow, so it sort of evens out. If you shoot the lightweight bow for a long time, your hunting bow will feel heavy, but it should feel normal again after shooting it for a week or so.