I picked up around 350 rounds of Malaysian M193 a couple of weeks ago, and I finally got around to chronographing the load through my 16" Rock River M4gery. I also shot the M193 through a 22" rifle. Here are the results:
Barrel Length: 16.5"
Temperature: 48*
Chrono 12 feet from muzzle
Malaysian M193, '84 Head stamp (16.5" bbl)
3074 3086 3065 3058
avg: 3071
SD: 12.09
med: 3069.5
Malaysian M193, '84 Head stamp (22" bbl)
3276 3292 3252
avg: 3273
SD: 20
med: 3276
Accuracy was around 1.75-2" @ 100 yards
Winchester Q3131
3037 2987 3044
avg: 3022
SD: 31
med: 3037
South African PMP .223
2801 2766 2812
avg: 2793
SD: 24
med: 2801
Wolf Polymer
2666 2666 2661
avg: 2664
SD: 2.8
med: 2666
The Malysian M193 performed about as expected, as was fairly accurate. It was also close to the Q3131, but velocites were more consistent. The PMP was quite a bit slower, but has been reasonably accurate. The big surprise was the Wolf Polymer. I knew the Wolf would be slower, but I had no idea the velocities would be as consistent as they were. Granted, I only fired three rounds, but I was running out of daylight. However, a standard deviation of only 2.8 is excellent for any ammo!
I also clocked a little .308 ammo through my 20" Savage heavy barrel.
LC Ball, '91 headstamp
2569 2583 2583
avg: 2578
SD: 8
med: 2583
Remington 150gr Core-Lokt factory
2588 2677 2661
avg: 2642
SD: 47
med: 2661
The Lake City turned out to be decent ammo, averaging around 2" @ 100 yards and better than minute-of-bad guy @ 300 yards. Never shot for actual groups at 300 yards, just a chest sized steel plate we have hanging at the distance. The funny thing was, I could shoot the gun from the prone position, and still be able to get the scope back on target (after recoil) before the bullet hit the plate!