Guys, I think we all agree 800-X is the most powerful 10mm powder out there, but the more I play with this stuff, the more it starts to bother me. What in the hell is the deal with the load data inconsistencies? Does anyone really know? Anyone that's been around 10mm reloading for even a few weeks has no doubt seen or heard about the now infamous 135gr Nosler load, but that's not what really bothers me. What really bothers me are the inconsistencies in other weight bullets. For example, my new Hornady book says a 155gr XTP maxes out at 11.5 gr of 800-X (CCI 300, COAL 1.260" for all loads unless noted otherwise). It says that load does 1350fps, but I KNOW that's crap. Also, I see other sources maxing out BELOW 10.0gr with a 155gr bullet!!! What is the deal?! My only guess on this matter is that 800-X has some crazy characteristics. Here's what I mean: in my testing (load workups) it seems that case expansion with 800-X increases to a point, then as you push further, it actually DECREASES for a bit, then starts rising again. To clarify, it almost seems to have a FALSE maximum that comes in early, but can be pushed through. Is this perhaps the reason some books stop so low? Maybe they are hitting the premature maximum, thinking it is max, and stopping the work-up. I have noticed this during "in field" case measurements, but since I only tend to keep my last grain or so of worked up empty shells separate for further home measurement/inspection, I don't have hard number to back it up. I just remember hitting a case expansion figure that was near my max at a charge well below book max, but after carefully pushing on, the expansion seemed to decrease a bit then increase again. Has anyone else had similar results? By the way, this is only based on remembered "in field" measurements and should not be taken as fact. Please don't think this is fact and push beyond pressure signs. At this point this is nothing more than a curious observation and cause for discussion. Wanna kill these ads? We can help!