One of the biggest problems with the various sorting methods that try to make Thunderduds into match ammo is that you can't eliminate or test (nondestructively) some of the most important variances: consistent priming and consistent bullet base shape & weight. Nor is it practical for most of us to go through multitudes of ammo seeking performance quirks from a certain lot #.
I just buy and try a box or two of good quality ammo, then go with the best one that accomplishes the goal for the least amount of money.
Sometimes it's just regular old CCI, sometimes it's middle ground RWS or Eley. My skill limits me to the mid level European stuff at best.
