As a bore cleaner, it is great for rusted bolts in the bore!
Does not do anything for carbon or copper which is what is found in most bores.
If you want carbon and copper removed, Montana Extreme 50 BMG is what most of the LR BR shooters are using and most borescope their guns routinely.
Proven to remove carbon and copper better than anything we have found, and most have tried every product out there.
Does not harm the bore contrary to crazy statements made by uninformed.
As for lubricants, you will find most will give you a much different cold bore shot until it is shot out. For example Kroil will give different POI on first shot also. ME has a bore conditioner that is best at not doing that as anything I have seen.
BH