Most shooters are not going to notice the difference between a ball that is perfect and a ball that is out of round and off weight at 50 yards or so. I shoot over the log matches at 60 yards. The groups I get with swaged round balls average only slightly larger than the best groups I get with perfect cast balls. However; at the end of the match, for the top few shooters, 1/10th of an inch can be the difference, so anything a shooter can do to be more consistent will be worth it.