This thread is old I know... But I wanted to post an observation. That stave Pat gave me was 75 years old. It's been 8 years since I made that bow, and a few years since I shot it last. I strung it up today and the scale showed it pulling 40 pounds at 20. If I calculate that out, it's 58 pounds at 26 right now, when it used to be 50@28. It's gained 8 pounds, on a stave that was 75 years old in 2015. I suppose osage never stops curing.