I bought range brass to load my 40 S&W. Using a SDB I had about 30% fail to pass the gauge. I single sized a couple hundred rounds with my RCBS carbide die, then loaded with the SDB. My fail rate dropped to about 5%. My caliper indicates about .002" larger. The "no go" rounds seem to go thru my M&P hand cycling. I'll get to the range in a few days to try the "no go" rounds.