zvtTEQy June 18, 2017 at: 960 × 720 In: Does Pointing Your Gun Up Affect Accuracy? ARDEC Study Reveals the Effect of Weapon Orientation on Ammunition Velocity and Consistency [NDIA 2017] ← Previous A slide from the ARDEC presentation, showing the test data for 5.56mm M855 ball and M856 tracer ammunition. Note the low difference between results at different orientations; this is due to the fact that both M855 and M856 have very low ullage.