See quot.

1

1706.  Phillips, Burrel-shot = Case-shot.

2

1730–6.  Bailey, Burrel Shot [with Gunners] small Bullets, Nails, Stones, Pieces of old Iron, &c. put into Cases, to be discharged out of the Ordnance or murdering Pieces; Case shot. Hence in Johnson and mod. Dicts.

3