My only problem with shooting reloads for practice and WWB for matches is you need to match the reloads to the loaded ammo's performance. From playing paintball for years, you see folks wanting to shoot the cheap stuff for practice and the good stuff for a tournament.
If they don't shoot the same, is there any benefit? I totally believe in shooting what you practice with in a match. Makes more sense to me.
That being said, I haven't even shot a match yet. Hopefully I get to pick up my G34 next week.
Just my opinion, I could be wrong.
thanks