Just finished up testing the Silver Bear 5.45x39 round from my Iron Clad Armory AK-74. The test was shot at 15 ft, 40 degrees, and 300 ft of elevation and the Clear Ballistics FBI spec gel block was used with 4 layers of denim.
-2782fps, 1030 ft/lbs energy
-Tumbling started 2'' in
The manufacture of the gel block, Clear Ballistics, claims their gel meets FBI specs for testing. I calibrate my gel per their specs prior to testing and use 4 layers of denim per IWBA protocol.
However, by no means am I saying this test is a substitute for the great work industry professionals like Dr. Roberts and others do. I'm just a shooter that likes to learn about the products I use.
Here's the video of the test:
Silver Bear 5.45x39 Gel Test HD Video Link