scooter123, the .40 S&W wasn't even a dream in someone's eye when Speer #8 was published, so your warning doesn't hold, man.

As for your problem, NJM15, I don't know why you are suddenly experiencing this problem. I take it that you have been loading for this pistol you are suddenly seeing this problem with for a while and all of a sudden you are seeing bulged brass with lower power loads, right? Have you been shooting Power Pistol with other bullets with no problems in this pistol? I don't think a taper crimp could cause bulged brass; headspace issues yes but not bulged brass.

One thing you could look at is to get a Lee Bulge Buster and run your 40 brass through it before reloading. Maybe the brass you are using already has a certain amount of bulge and it's just showing more now. I wish I could help more, but I don't own a 40 or reload for them either.