I've read and seen some info about different percussion caps effect on accuracy, velocity and reliability. According to "Remington" the "new" #10's and 11's are "40% hotter". Than what I do not know. Then there is CCI Magnum and "regular". I was bored, curious and felt like shooting. I used CCI #11 magnum and Remington #11 "40 % hotter" in the same rifles with the same loads. My chronograph didn't show a difference and neither did my groups. Depending on the rifle, one seemed to fit better than the other on specific nipples, but they each worked. I noticed the CCI is a slightly rounded cup while the Remington is really flat. Anyway, does anyone actually see a difference with the most recent percussion caps?