I expect the off the wall, non-answering posts from Al.
LOL!!
What you've not yet realized is that primarily THIS IS A BENCHREST FORUM. With guys who shoot real benchrest gear.
Yeahh, you'll get some opinions from non-BR guys and you can do with them what you will but think about this......... why would you presume that the tiny subset of folks WHO SHOOT THE SMALLEST AGGREGATE GROUPS ON THE PLANET would all do the exact same thing "without testing"??????
Absolutely NOBODY, not one person on this planet shooting 100/200 Group or Score uses a mandrel.
Nobody.
A few longrangers still use mandrels cuz they don't know no better (and can still win occasionally with a quarter-minnit gun) but they're learning.
From being continually FLOGGED by the eighth minute guns.
And OF COURSE we've "tested"..... every friggin' day shooting is a "test"...... and if somebody started winning while dragging their casenecks back over a sizing mandrel then ever'body would test it all over again..... but WINNING is the real "test."
Yet you "assume" ever'body's just a bunch of lemmings? That you are "better?" Cuz your common sense tells you "mandrel=better"......????
Show some rows of 1/10 inch groups..... post some pix of rows of 5-shot dots that you fired from your "awesomely consistric reloads"
I can go shoot a row of dots right now.... I can go out and turn the lights on on the range and shoot 25 shots in a row without sighters and there won't be any paper in the 5 round groups..... and send an auto-dated camera pic....on call, any time......day or nite
And you don't even fire sighters, nor know why you would.....
Mayhaps if you asked QUESTIONS like
"hey, how come you'se guys use sizing buttons instead of mandrels?" instead of cluttering the thread up with your totally unsupported assumptions and guesses you'd get more useful interplay....