Yup,Jacob. This was designed to help prevent flame cutting/errosion. Some argument on this Forum,I think,as to if it was needed. Only gun I can think of that had this as a chronic problem were the Ruger Super Blackhawks in .357 Maximum. Weren't on the market long,and William B. yanked em off the market. Bought up a lot of .357 Maximum brass dirt cheap-to mill the rims down,slightly shorten and use in my '07 Winchester .351 Semi Auto. A helluva lot cheaper than factory brass especially the way that 86 year old girl sprays em out!-AND-they work fine! Bud