Between rounds is ok.  During a round is not ok.   --Jerry

No, that is illegal.  Sorry mate.

Hey Mark

If your playing with me you can change loft of your driver, change putter faces, carry 30 clubs. I draw the line at,  well I guess I don't draw a line, just play how it makes you happy.

Sorry I missed "tournament round".

I would suggest that before entering a tournament you get a rule book, or go to www.usga.org and study the rules a bit. As we've seen recently even the pros forget about some rules.

You definitely DON'T want to change settings during a tournament round. That's a violation of the rules. Hit some range balls before you play to determine which ball flight you're most comfortable with/is best for the course you're playing.