Biggest deer I have taken, to date, was with a 425 grain arrow from a 50 lb bow. I thought I loved that set of arrows for years until I accidently shot a much heavier arrow thru that bow. Suddenly I was realizing how much hand shock I was suffering thru needlessly.
So, yeah, you can hunt with those arrows...IF you can get good and consistent shot placement from many positions at moderate ranges. Save the loose change from your pockets each nite and in no time you will have enough money to pick up another set of shafts.