How big are they exactly?
Check out this thread for a little more info on large rubberbands.
http://slingshotforu...ds-on-a-budget/
I'm not the authority on this subject but I do own a box of 100% rubber Alliance Sterling size 107 rubberbands, and they pack a punch. There are a number of ways I can band up with them, and all achieve satisfying power to draw weight, length, and work put into it. They have an excellent snap and are rather thick so I think they will last quite well, time will tel, I just wish it wasn't so cold.
Therefore, depending on the rubberband, it could work I'm very happy with my Sterlings, and my standards are not very low I assure you.
Here is a little more info on them, I'm sure these aren't the only 100% rubber band options out there, but they are all I have experience with.
http://www.epinions....nt_505560993412
I hope that helped, cheers
- John