I did a search and did not find the exact answer I was looking for. I have a 9 year old 30-06 Weatherby Vangaurd that I have shot roughly a box to two boxes of shells through per year. When I got this rifle I was not aware of the break in process, so the barrel was not well maintained (cleaned once a season). Can I expect positive results using the Tubbs preloaded ammunition to polish my barrel or is this more for new barrels? I do not reload so the preloaded option is what I will have to use.