We can do math. If it starts out at .410 bore and needs to end up with a new bore of .510 how much wall thickness needs to be removed? Audience say .050 from each wall for a total of .100. So does your .410 have walls .050 plus another .025? Call it .075 walls to keep the math simple. If they are .040, which would be heavy and thick as heck, you are still going to break through .010 too soon and have infinity walls.
Now for the real math question. If train A leaves the station heading due north at 80 miles per hour and train B leaves the station heading East at 60 miles an hour how long before they meet? I actually had this question on an exam decades ago. There is an answer that I got correct. No one else did and I always thought the question was a test of how dumb the prof was.
