SO from this thread and the referenced one we know that chamfering may allow easier seating of the ball with the rammer, it might make such harder, it makes a revolver more accurate, it ruins accuracy, it must be done with precission tools and a Lee Case trimmer by hand works fine. It might also increase the incidence of chainfire while lessing the chance of chain fire. A skilled machinist has told us to not do this and a skilled machinist has told us to go ahead.
Man I love the web and the infernal net!
My guess is that it's whatever blows your skirts up.
WHen I was shooting three position rimfire I noted that scores improved when what folks THOGHT should work for them was tried and mysteriously when someone who did not believe such a change would be useful tried it it was not. This in reference only to accuracy. I believe that for most of us shooter skill and CONFIDENCE are the keys to accuracy more than the little tweeks we try. As far as accuracy goes I wonder if the difference between sharp chamber mouths and chamfered ones might not be how the shooter feels about them.
As to mechanical advantages in ramming force, that would seem to be straight forward as to measuring it. It is either harder or easier.....ecept it may be dependednt on ball hardness, how over sized the ball is, the angle of the chamfer, the qualities of the steel, how smooth the chamfer is, the prescence or abscence of some sort of lub, and local weather conditions.
DOes it cause or prevent chain fires? Is that with over ball soft lube or bare ball? Is that with wonder wad or equivilant or ball on powder? Is that with filler or with out? and in combinations? Is it an increase of 1 more chainfires per 2000 shots or a decrease of 1 less in 2000 shots?
I am interested in these discussions but sometimes it seems to come down to modifying Master Yoda's advice and "Do or Do not but for the Force's sake don't depend on the infernal net!"
-kBob