bronko22000
I was going to ask weather you were talking #11 regular caps or #11 mag caps... but that was not your question...
Flounder and Cayugad pointed out exactly what I might have said...
but I will add there is way to get around the cap falling off.
I was touring the Track of the Wolf site the other day and may have found a partial answer...
Go here...
http://www.trackofthewolf.com/Catego...Size=25&Page=3
find and check
ROS-05 and the next few under it...
These are slightly oversized nipples for the CCI and Remington caps - made as a direct result as t owhat you are talking about - the cap falling off.
The AMPCO bronze nipple is quite a nipple and long lasting to-boot...
I recently ran into this problem with the Red Hot nipples and even the RWS 1075 has a hard time staying on the nipple.
I have ordered some +5 - #11 nipples just to check the fit.