The best way is the way that is both most efficient and economic . It will also depend on the gun and how much work will be needed to do the job correctly and permanently .
There is no best way just that some methods better than others and some merely bodge jobs temporary to say the least.
I do not know how many guns I have rejointed but it must run into hundreds ,it sometimes seems that you spend longer deciding which way to do the job than you take doing it .