I have a Takedown 30-40 Krag built on a original Takedown Winder Musket action. Have shot it extensively with stiff Jacketed bullet loads. No signs of any problems. The Barrel is an original Takedown that came to me with the Takedown ring with very good bore. I built it as a Deer Rifle and shot it quite a bit and have used it for hunting in Maine as a backup. So far no signs of trouble. Many Winder muskets were rebarreled to modern high pressure Woodchuck calibers. Regards, FITZ.