http://greent.com/40Page/ammo/40/180gr.htm After reading the above article and its posted data, I've new appreciation for how tolerant and stable the 10mm is. Look at the 40s&w pressure data showing how pressure change in just 10mils of bullet set back, using 180gr bullet. Wow! And people are still buying them up without knowing that they are more vulnerable to KBs than other bullet weights. Also here is some interest info for those who'd shoot 40s&w in 10mm chambers. http://www.thegunzone.com/10v40.html I'm posting this for the benefit of new comers to the Big 10.