I used to use it a lot years ago for protection. I liked it as the felt recoil seems to be less abrupt compared to 700X. The only trouble I found with it was having such low pressures, there was a lot of unburned powder left in the barrel. I know people will tell you I am all wet on the felt recoil statement but my cheek will agree with me.JMHO
800X is better suited to heavy 1 1/4oz 12 gauge and standard 20 & 28 gauge loads. 800X has a large flake size and does not meter well, press operation must be very consistent to insure consistent powder drops.
I got a keg of 800x years ago because I thought you really needed high vel to break those clays. Lets call it a learning experience. I doubt my shells would have been ATA legit. Noise and recoil were high. Targets didn't break any better than with 'standard' trap loads. Like other posters have said, 800x is much better in a heavy 1 1/4 Oz hunting load application.
I too have used it and all that was said here is true. It will crush targets if they are pointed correctly. My biggest concern with it is the +-.5 grain average spread. Most drops will be close to right on, but some will be -.5 and some will be +.5 grains. That is a potential 1 grain swing between shells. If that does not bother the 6 inches between your ears, use it.
For trap loads, I think it's a little slow. Field loads in the 1 1/4 oz range would be a better use as would some 20 ga loads. I've never had real trouble getting it to meter consistently. It might vary a tenth or so more or less than other powders. It's a great handgun powder in certain calibers and loads. Something like Green Dot, Unique, Herco, Universal Clays, PB, and a host of others might be more appropriate for handicap loads running 1200 fps or more. I usually get better consistency with loads developing 8500 PSI or more, especially in colder weather. I usually don't go over 10,000. Primers can make a difference in consistency and pressure, especially in colder weather. My favorite heavy handicap load uses the Downrange Versalite Wad, Unique powder, and a Remington hull. I load them to 1250 fps and have selected a primer that works in all weather and gives good consistency (velocity) from shot to shot. They were consistent in a larger bore barrel in colder weather, where many other loads were not.
I agree with Martin. When guys began loading trap loads with 800X when it first appeared on the market for reloaders it was supposed to be the end all for powders. You could tell immediately who was shooting 800X reloads, it was LOUD! Common things they would say is, "that guy is shooting an illegal load!" "I can tell by the sound!" That was when reloaders were led to believe that a 3 dram 1200 FPS load was the velocity limit for trapshooting?