Nowadays I reload for about half the cost of factory ammo, but even with specially taylored loads the results are about the same for me. So my reloading is mostly about saving a buck. If money were no object I could happily play the game with WWB.
One area that I do find problems is changing loads. I mean if you practice and get good with one load there is an "adjustment" period for me when I switch it up. Its not huge and will only cost me a few points down here and there, but if you're trying to be super competitive the change can mess with your head.
However, regardless of what round you settle on be sure to take it out to the range and shoot some slow fire 25yard groups off sandbags -to make sure where that gun puts those rounds and to check if the sights are setup the way you want. Even in IDPA you will sometimes get a longer range target thrown at ya -and I've seen many folks struggle. Most of the times those bad shots are shooter error, but until you test the gun/sight/ammo combination off the bench you can't be sure.