I haven't used any of the MEN yet, but FWIW have used thousands of rounds of Winchester Q4318 NATO in the white boxes and a lesser amount of the Winchester Ranger tan box NATO and IMI NATO. I've chronographed all three versions in a variety of pistols and revolvers and in the Marlin carbine. I called a Winchester LE rep. and inquired about the Winchester NATO in the White and Tan boxes. He confirmed it is the same ammo meant for different markets. I found no difference in the chronographed velocities of these two. I also chronographed some of the newer Winchester Q4318Y NATO ball and found it no different than previous Winchester NATO versions. The Winchester 9MM NATO averages ~1230 FPS in a 5" barrel, ~1300 FPS in the 16" barrel. The IMI 9MM NATO runs ~1270 FPS in the 5" and ~1350 FPS in the 16" barrel. Velocities in different guns, even with the same barrel length, will vary. Extreme spreads and standard deviations indicate quality ammo. The Winchester NATO requires the primer crimp be removed when reloading these cases. The IMI is also crimped, but much more lightly, and did not require crimp removal when reloading those cases using my Dillon 550 press. There were no issues in using the NATO 9MM in my guns.....ymmv