A few decades back I got fairly serious about it: I had a custom five-shot Ruger in .45 Colt and was trying to duplicate Seyfried's "MOA" revolver. Mine wasn't quite as accurate as his - and I probably didn't shoot it as well - but I still ended up with a collection of two-to-three inch 100 yard groups. I tried several different approaches to "match prepped" cases (I was also competing in benchrest at the time, with a 6PPC on a Stolle action, so had all the tools) and found that none of them helped at all. My opinion since then is that revolvers - even the best revolvers made - simply have too much slop/tolerance/whatever for things like flash hole burrs to stand out from the noise.
