I'm not sure where this bit about match rifle comes in... But having grown up shooting the dang things, since the early 1960's the first time I ever heard of enlarging flash holes was just a few years ago on the internet...
As I said in previous posts if a person is loading unmotivated winchester brass, black powder and bullets from the original Ideal moulds, achieving the velocity and accuracy specs of the US government, I'm just not sure what more could be accomplished by wrecking cases..
I guess at this time the proper thing to do is to acknowledge we have different ideas, experiences and opinions, and leave it at that.