Is there a reason you cant? no. there is no reason you CANT.
You should not because you will more than likely have bad form, you will more than likely slap the crap out of your forearm every shot. you will not have a solid back wall to stabilize your shots on a constant basis. your anchor point will more than likely change with every shot due to not having a back wall. you will creep on your shots and be very inconsistent with arrow placement.
Now with all that being said. You can create a form that will work and you can become good with it but it will take time and practice. over all it is just better to get what fits. Kind of like pants. get a pair to big and there is a lot of room for error.
Last edited by East Texas Archery & Bait; 03/05/13 08:41 PM.