If you are shooting a major match and you need the guaranty of making power factor I suggest buying match ammo at an event. BUT, you have to purchase this ammo for that specific event. Let's say you buy 2000 rounds at a certain state match and keep that ammo to use at the following Area match but it fails to make major, you are shooting minor. Even though you bought that "match" ammo, even though it is the same supplier of both matches, even though they do not really change their recipes. You are shooting minor if at all.
Just because it is "match ammo" doesn't make it any different but you are paying an insurance premium.
I just load my own and make sure it'll make the required minimums.