I've been reloading for all of my guns about 20 years now. When I load for competitive target shooting or practice with my competition guns, I deburr the flasholes. Other than that, I never ever debur them. I must admit, I cant really tell the difference in the way I shoot either way. However, that resultProbably has something more to do with my 60 year old eyes than it does with my loading tendencies. Heck, I'm not sure that I could have even told the difference when I was the tender age of 40!!!