I went through a bunch of Federal aluminum in all 3 flavors yesterday. I have had some come out of the box with set back. I threw 2 .40's away. Being a high pressure round with the heavy 180g weight I didn't want to take the chance of a KB. Research on .40 bullet weigh is the heavier it is? More chance setback will increase your chance of a KB. One of my 4595's has a problem feeding off the top of the mag and just feeding. With the jams I got varying degrees of setback. I threw away one round. I also found a spent casing with a very long crack that was 3/4 of the length. I think I will separate this stuff from my stash and eventually burn it up and not replenish it.