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sorry for the confusion. The original post was for a double feed of unfired rounds but that was back in 2010. I added onto this thread yesterday because I was having issues for the first time yesterday where the FIRED round was not being extracted and was wondering if anyone else had any issues with that particular ammo as I've never had this problem before. Or if anyone had any ideas on what might be causing it.

The correct term is Failure to Extract. On a semi-automatic, the first round is fired, but the extractor doesn't pull the spent casing out to eject it, causing the next round to be forced in behind it, slide partially back.
Here's an example from googling "failure to extract"

Sorry to Bring up an old thread. I did a search and only found this one topic so I thought I'd add to it instead of cluttering up the forum with a new one.

I have a Ruger SR40C that I've had for a little over a year as my EDC. I have never had a single problem with it, ever...until today. I went down to Shoot Smart on 35 and bought a box of 100 count Winchester White Box to put a few rounds through the .40 while I was there primarily to break in my new S&W Bodyguard.

Of the 50 rounds I put through it, I had 5 failure to extract (I don't like the term double feed). FIVE! That is an average of one per full magazine. It happened usually on the 2nd or 3rd round an one on the 6th round. I keep it really clean, have only taken it to the range 5-6 times since I've had it in the last year, I'm definitely not limp wristing it and I've never had a single problem with it until today, using this ammo. The first two magazines I put through it were Hornady Critical Defense, because it's just a good idea to shoot the type of ammo that I carry. No problems with it.

Could it be that my gun just doesn't like standard Winchester White Box? I can see no visible damage to the extractor.
Any ideas? Or has anyone experienced anything similar?