I have always used CCI #11 caps with no problems. However, recently I opened a new tin and found that 56 of the caps would not fit the nipple --- too small. I tried 2 new nipples (as well as a friends 2 guns with #11 nipples) and the same results. Unfortunately this was the very first time I purchased a whole box (10 tins). I checked 4 other tins and found anywhere from 50 to 64 caps were too small in each tin. I wrote to CCI explaining the situation and asked if they knew of any problems with this lot and got a quick reply, saying the do not. I was asked to measure the inside and outside diameters of the small caps and let them know. I did that a few days ago and am waiting a reply. They wanted to know the lot number (on side of tin top) to check. The number is B01T. Does anyone have any tins with the same lot number?? If so, could you let me know and I can pass the info on to Justin at CCI. The small caps average .004" smaller than the good caps. I like CCI caps, just can't use the small ones.