I have used it in some old milsurps in order to get the copper build-up removed. IIRC, it has some pretty severe warnings on it stating DO NOT leave it in the bore for more than 15 minutes. I have since moved on to Bore Tech Eliminator ... it works as well as 7.62 Sweets but without the stern warnings .... Really have not found anything that does a "great" job on removing copper ...
It seems to take the copper out as well as the carbon.
I also have some butch's bore shine to try after I exhaust my current supply of shooters choice.
As captain said sweets has some warnings due to the fact that it is a concentrated ammonia based copper remover. I would use it if you had a serious copper build up but less concentrated solvents will be more than adequate if used regularly.
Works better than anything I've used, Shooter's Choice, Butch's, etc., but as the warnings state, don't dare leave it in >15 minutes or even less in the Deep South--if it dries in the barrel, your barrel could be marred. I learned that the hard way.