Re: OK I have a question about rifling... no so much shooting related.
That is like saying there are 7 billion people in the world therefore 100,000 people must have the same DNA.
The fact is that no 2 peices of steel are the same. They will react differently to the tooling being used. Tooling wears with every barrel it passes through and will be micrscopically different each time it makes a barrel. Some barrels are lapped. There is no way 2 barrels could be lapped the exact same way. Shooting and cleaning alters the barrel as well. There is no way that microscopically, 2 barrels are equal. This is why they call it 'fine striations' It takes a micro scope to see these differences. There are simply too many variables to make barrels have the exact same fine striations.
Long range shooting is a process that ends with a result. Once you start to focus on the result (where the shot goes, how big the group is, what your buck will score, what your match score is, what place you are in...) then you loose the capacity to focus on the process.