Thought I would post my chrono results on two different lots of SB SS109 and Igman blacktip SS109. The Chronograph was a F-1 Chrony setup at roughly 15 feet from the muzzle. The rifle was a Colt 6400 with a 1x7 16" barrel. Ambient Temperature was 75F and elevation was roughly 1000 feet.
First ammo tested was some 94 SB, lot # 01-SB-94. This was bought back a few years when SB first showed up on the market. Results are as follows:
Five shots at velocites of:
<BR>Mean = 2956, Std. Dev. = 26.1
Second ammo tested was 93 SB, lot # 03-SB-93. This was bought recently from Sportmans Guide and came in battlepacks.
Velocities are as follows:
<BR>Mean = 2929, Std. Dev. = 15.2
Third ammo tested was 02 Igman, lot # IK 02-02. This was bought recently from AIM Surplus.
<BR>Mean = 2988, Std. Dev. = 24.4
No failures to function of any kind for all three lots of ammo. The SB rims looked OK, there was a little bit of rim deformation but not any worse than seen on other types of ammo. The day was fairly cloudy and the muzzle flash from the SB was quite evident through a 4x scope. There was no noticable flash from the igman stuff. Both lots of SB shot to the same point of aim, the igman hit about 1 to 2 inches lower at 100 meters.
Shot both the SB and Igman at a 1" thick steel plate, both penetrated a little deeper than M192 (maybe 1/16 to 1/8 inch more) with the igman penetrating a little bit more, but not by much.
Thanks for the info. I wondered if the Igman was hot enough. The number look pretty good should do better out of my 20 inch barrel I will have to look at getting some.