It's not always true,but a lot of times,ball powder isn't quite as predictable as extruded powder in my experience,especially in hotter overbore rounds like the 25-06.I can use either IMR or Hodgdon 4831 and all is well.Ball powder can be harder to ignite,and less temperature tolerant.I've seen a little something change in an individual round cause CFE-223 make a mess out of a 308 case...blown primer,pocket so stretched a primer could rattle around in it,severe change in recoil,and when the rifle ejected the brass,it was deformed from the extractor.It was an AR-10,and I still can't say what happened.It was once fired Lapua brass that was trimmed,and the charge was 2 grains under max.Maybe the bullet moved during feeding,I don't know.I've also seen some excitement from WW760 and 748,but not that bad.There must be some reason all the powder companies make extruded powders.If the small granules work so good,they would all be making ball powder because it meters so much better.