The only round I have problems with squibs is 38 specials. For some reason I don't get powder in them. Have no idea why. If it was hung up in the 550b powder funnel I would get the next a double load. Never have those. I now watch every case to make sure there is powder in them. I also load for 380 45 223 and 30-06 and never had a squib. It's like understanding quantum physics.