I've seen a load chrono over 1600 fps from a Desert Eagle. Problem is it was a double charge my grandpa threw while not paying attention. He then had to have a gunsmith clean molten brass out of the firing pin channel and gas system. Pistol still functioned fine afterwards. The Desert Eagle can take full power ammo. But it has to be pretty hot to get it much over 1200 fps. My dad has been trying for years, and he has a reputation for liking loads a little hot. I could see maybe 1300 fps, but 1400 is a little generous. You're probably not SAAMI spec at that point. And the thing is, 1300 fps still doesn't give you a drastic increase in power over the 10mm Auto. I was being pretty conservative with the ballistics on the 10mm Auto as well. A 240 gr .429 caliber @ 1200 to 1300 fps isn't going to kill much any faster than a 220 gr .40 caliber @ 1100 to 1200 fps. The 10mm has at about 3/4 of anything the .44 Magnum can throw out of a Desert Eagle. Frontal area, mass, energy...however you want to define killing power. That is why the Desert Eagle just doesn't strike me as practical for anything but fireballs at the shooting range. Now if you want to throw the .44 in a 7 1/2 in barreled Blackhawk, that is a different story. The point is, from experience, I can tell you anything getting much more than 1200 fps from a 6 inch barreled Desert Eagle probably isn't SAAMI spec.