Zayd bin Aslam narrates from Sayyiduna Abdullah bin Umar (may Allah be pleased with them both) that game killed with a pellet (a clay ball shot from a sling) is to be regarded as having died from a blow with a blunt object.
Hadith Referenceالسنن الكبرى للبيهقي / كتاب الصيد والذبائح / 18946