Since the barrel is one piece I don't think how tight it fits to the grip/frame would have any bearing on how accurate it is. Now, a tight chamber that is another matter.
I have taken my MKII Govt. Model apart a number of times and any time I run a patch down the barrel I pull the bolt. As others have said they don't really need to be stripped that often. If you follow the instructions they are not difficult. As a teacher, I know how well some people are able to follow instructions....
