I have a 300 RUM that may be a candidate for it and I am looking for some shooters with first hand experience fire lapping a barrel and the results they saw. My opinion has always been to not do it but this rifle has been a little frustrating. It's factory Remington barrel that has less than 100 rounds through it and copper fouls badly after only three to four shots, enough so that accuracy noticeably drops. Clean cold bore and second shot accuracy is very good and consistent. I had it bore scoped and it looks OK from end to end just not great. Thanks for any help or advice.