I am shooting a Morrison 62 inch re-curve, 52#@28inches. i am drawing it to 29 so am guessing I am shooting 55#. My arrows are gold tips with 145 grain target points and 100 grain brass inserts for a total arrow weight of 525 grains. Have not had an arrow go clear through yet, but have had them go almost to the feathers when you hit a shot up spot. If they start going through, I will unscrew one side,flip it 90 degrees and screw it back on so the front and back holes don't line up anymore. Or I may just add another layer of carpet.
As a backstop to a deer target I don't think you would ever wear one out.Using it as a primary target, it may need to be replaced once in a while. Mine is still going strong after 9 months of shooting blind bale or hanging targets on it.
CKR