I just recently bought a new 700 police in a .308 but dont have it scoped up yet. I was reading through midway and (cant remember the exact name) came across these slugs, that looked like bullets, there were 4-5 of them with progressively diff. grits that lapped the bore. They claimed to a take a total of .0003 out of the inside is this something worth getting or wasted money. Are they needed with proper break-in? I have not yet shot this gun.