I get a nice fit from the #11 caps. I had tried the german made #1075 and was a little disappointed, they fit some nipples perfectly sometimes and other times they were not going on there without being hit with a hammer--and thats a bad idea.
I ended up throwing some of them away because I just couldnt get them on the gun.
I do pinch the #11 caps just slightly to get a good tight fit and that doesn't bother me but if I can find some #10s I'll try them out and see how they do with my pistol. I had just bought another pack of #11s and it says on the package "40% hotter" and I believe it. They blow up real good!
