Aug a3, 2 barrels, a chrono, and a bunch of ammo

Hey Guys,

Had an interesting day at the range yesterday. I’m pleased with my AUG but was surprised about its inability to shoot American Eagle Black Box xm193 well (about 5 moa). It shoots centurion into a ragged hole, but XM193 looks like a shot gun pattern. My goal is two range trips. One to get ballstic info, and one to get accuracy info, and then decide what ammo to buy. I also wanted to see what the 20 inch barrel actually gives me over the 16.

I was using a Steyr Aug A3 with a T1 and a 16 inch barrel (that came with the gun) and a 20 inch USR barrel. 60 degrees, intermittent showers - your basic Seattle day. Here are some interesting call outs:

• American Eagle “tactical” XM193 sucks. IT is extremely underpowered. I reset the chrono frequently and split the testing, intermixing a known good round of IMI in the magazine. I’m confident that there is a problem with this specific lot of ammo.
• The South African was among the hottest with the 16 inch barrel but was slower with the 20 inch barrel.
• Wolf is underpowered and slower out of the 20 inch.
• Winchester Q3131a was hottest all the way around.
• IMI M855 is as hot as the 55 grain stuff most offer.
• Priv Partisan ammo is consistent.

I shot all the rounds over the chrono with a T1 at a man size steal target at 200 yards. All the ammo, except the underpowered XM193 was minute of man accurate. I’ll do the accuracy testing later this month. Here are the numbers:

Centurion 55gr 16 inch 20 inch
3049, 3116, 3136, 3109 3259, 3173, 3183,3178
IMI M855 62
3113, 3050, 3081,3066,3060 3204, 3203, 3212, 3204, 3237
PMC Bronze 55
3009, 2980, 2980, 2965, 3039 2996, 3055, 3067, 3030, 3053
Wolf 62gr
2905, 2966, 2944, 2898, 2888 2873, 2878, 2956, 2933, 2941
South Afr. 55gr
3183, 3211, 3224, 3218, 3213 3169, 3158, 3311, 3142, 3144
Winch q3131a
3301, 3283, 3322, 3267, 3290 3314, 3563, 3407, 3312, 3326
Priv Partisan 55
3263. 3178, 3250, 3172, 3240 3330, 3269, 3271, 3320, 3305
American Eagle xn193
lot smq096637-358
1894, 1800, 1850, 2164, 2168,
2023, 1985, 2053, 2121, 2016
Federa/ xm193 (2004)
3163, 3141, 3141, 3121, 3133 3237, 3316. 3230. 3163, 3211

Anyone else run into this issue with recent XM193? Hope y’all find this intersting.

This is easier to read.

Centurian 55gr
16 inch 3049, 3116, 3136, 3109
20 inch 3259, 3173, 3183,3178

IMI M855 62
16 inch 3113, 3050, 3081,3066,3060
20 inch 3204, 3203, 3212, 3204, 3237

PMC Bronze 55gr
16 inch 3009, 2980, 2980, 2965, 3039
20inch 2996, 3055, 3067, 3030, 3053

Wolf 62
16 inch 2905, 2966, 2944, 2898, 2888
20 inch 2873, 2878, 2956, 2933, 2941

South African
16 inch 3183, 3211, 3224, 3218, 3213
20 inch 3169, 3158, 3311, 3142, 3144

Winch Q3131A
16 inch 3301, 3283, 3322, 3267, 3290
20 inch 3314, 3563, 3407, 3312, 3326

Priv Partisan 55gr
16inch 3263. 3178, 3250, 3172, 3240
20 inch 3330, 3269, 3271, 3320, 3305

American Eagle XM193
16 inch 1894, 1800, 1850, 2164, 2168, 2023, 1985, 2053, 2121, 2016
20 inch

Federal XM194 (2004)
16 inch 3163, 3141, 3141, 3121, 3133
20 inch 3237, 3316. 3230. 3163, 3211
.

Well that explains why you were getting such poor results using XM193 when you first tried it…

Yeah, its sort of a relief actually. Glad to know I didn’t end of with some expensive prom queen that wouldn’t run.

Also was intersting to see that at most… the benefit of the 4 extra inches of barrel was a five percent improvement in velocity.

Ye of little faith… :wink: