watched it through the first several bullet strikes, intesting stuff, but I think missing some vital points attempting to recreate the Civil War bullet strike fusion.
One of the things I didn't see taken into account, is the speed which those two Civil War bullets were actually moving when they struck each other. We have, of course, no way of knowing, or finding out, but I think there are few assumptions we can safely make.
First one being, it didn't happen at point blank range. So I think its safe to assume that those bullets were not moving at their top speeds when they hit. Its not impossible to consider that that freak Civil war strike might have happened after each bullet traveled some distance, possibly even a few hundred yards.
Admittedly I only watched for about 14 minutes and not the entire thing, so I may have missed something later on will watch the entire thing when I have more time for that.
What I think would be needed to recreate the Civil War bullets is FIRST determine what speed each one needs to move at in order to fuse, and not shatter. THEN once that is known, you work on a mechanism to ensure they meet, "head on".
I used to enjoy watching Mythbusters, but eventually got fed up with them "busting myths" using tests that did not take all factors into account, and especially when they decided a myth was "busted" simply because THEY could not do it with the test they devised.
One in particular that bugged me was they "busted" the "myth" of a sniper shooting another sniper through his scope. They couldn't manage to do it, despite it being a documented fact it has happened.