OK,
I accept that the M16A2 burst mode is more like fullauto "on a budget" rather than the controlled-spread super high-rate burst envisioned by SCHV/SALVO. However since weapons like the various SPIW prototypes, the G11 or the Russian AN-94 were either not completed or not issued for servce, the A2 with its burst feature seems the closest to a real field test of the concept.
But let's leave aside the long range results per SCHV/SALVO. At ranges up to 50 or 100m, over a short time period will the soldier score more hits with burst than semi-auto?
Do American soldiers use burst as the primary setting? In the IDF we don't have the burst feature on our M16s. We use semi-auto 98% of the time. Fullauto is reserved for short range (<15m?) ambushes and room/trench clearing, although some claim that rapid semi is better for that as well.
For kicks (and reciving a scolding by the girl instructor), I fired some 2-4 rd fullauto bursts at the 25m zeroing range last summer. Though I think I kept them all on the silouette target, I doubt that my spread was less than 10 in so I'm very impressed that someone can get 8in groups at 200 yds. This was off a bipod too.