I just used a 6 pack of Anchor bottles last time I bottled a batch. I was worried, as my wing capper was basically 'bottomed out' right after it started to press the cap down. I can tell, looking side by side, that the bell of the capper didn't go all the way down over these caps like it did on my other bottles, but they seem to all be holding pressure just fine. I tried letting one sit upside down for a while, and there was no evidence of moisture.
When I start drinking this batch, I'll probably start out with these 6 bottles, so I'll post up here if any of them have gone flat.
Oh, and the issue, for those that may not be aware of it, is that the lip that is normally found on the neck of the bottle, which the wing capper 'grabs' and used for leverage, is located so close to the top that the arms of the capper are almost all the way down before the bell even hits the cap.
By the way, one of the bottles I got from a friend had absolutely no lip at all. If I didn't already toss it, I should take a picture.