Instinct is correct, it could end in injury. One thing for sure, they will never be accurate at a higher poundage. You always need to get arrows that are spined (stiffness) for the poundage you are shooting. Just about every arrow manufacturer has a chart you can use to determine the correct arrows for the bow you are shooting.
If you want to put your information on here and what brand of arrow you want to shoot, I'm sure someone will help you determine which arrow you will need

Good luck,
Fulla