I'm having some issues with the resizing of my .40SW once fired brass. Using a Hornady FL resize die, on a LNL AP (Station #1).

Thanks Wingman; do you know why I'm getting this issue and why is it called Glock brass syndrome?

Because Glock (and many others) have an unsupported chamber.

Not to mention that the bulge is one way to tell if it is usually (not always) shot from a glock, Although if you look at the primer you will see the normal firing pin indentation along with what looks like a rectangle around the firing pin indentation. If you see that rectangle it means it has been shot from a glock.

The brass can be reused but it requires a bit more work to get the whole case back to normal than if it was fired from a different gun.

I use the Lee bulge buster die and like it very much. It is an extra step and sometimes you'll get the odd case that needs to be run through twice but it's invaluable when you've got range pick ups that someone surely shot through a glock.

Sometimes.  I've never had any that bad.  Here's three I just sized with an RCBS sizer...no other work



sized

It appears that Glock has addressed some of this problem.  Mine is like the one in the middle.

I run every .40 S&W case through Reddings Gx-r die. (I may have the letters wrong) It and Lee's die already mentioned forces the bulge out and allow perfect resizing thereafter. I get a bulge at the base of the case when shooting my Sig 229 and my Glock 23. My S&W M&P .40 does not bulge the case at all.

It's easy to see how the bulge could cause an out-of-battery ignition. A lot of Glocks have been damaged shooting reloads. Some people have been injured slightly. I want the bulge gone and am willing to add another step in the reloading process to make it happen.

Glock are known for their reliability, part of the reason is their chamber design. I have a newer model, but am leary anyways. There is no way for me to shoot and be happy about it without reloading. I'm not independently wealthy.

I use the EGW under size die in station one with my 550b . I'm hitting the 7000 round mark loading fortys with no problem.
http://www.egwguns.com/undersized-reloading-dies/

As mentioned earlier, the RCBS die sizes this bulge away.  I use them in my 550B for .40 and more than half of the brass I pick up has glock bulges.  I just got a set of Dillon dies for 9mm and looking at the re-sizer die, I think one in .40 would also handle Glock bulge without issue.  You didn't mention weather your size die was carbide.  Even if carbide, perhaps a little lube might help.  OK, I just looked at Hornady's web site and they use a Titanium Nitride coating on their sizeing ring.  Look at yours closely and make sure that there are no flaws in the TiN coating on the surface of the sizing ring.  This coating is sort of like chrome plating and if it has a discontinuity in it, the resulting edge will shave brass.  I have a Redding neck bushing that does this.  The TiN is a gold colored band inside the die at it's base.  If it is the problem, I'm sure Hornady will make it right.