I have shot 1000's of bismuth handloads over a 20 year period in Foxes, Ithaca NID's, Parkers and LC Smiths and never had one issue with barrels. I only shoot 1 1/8oz loads with reduced pressure. I have a dozen hunting buddies that shoot TM 1 1/4oz loads and none of them have ever experienced barrel problems. Wood cracking problems yes especially those shooting 1 1/4oz-1 3/8oz TM loads on a routine basis. I shoot 1 1/8 Bismuth loads in respect of 100 year old wood and I rarely feel under gunned.