4 March 36 Eliz. Coroners Inquestion post mortem taken at Hackney on view of the body of Thomas Goldston, then and there lying dead. With verdict that on the 3rd instant between the hours four and five pm the said Thomas Goldston and a certain Richard Carpenter of Hackney yoman, sixteen years old were playing together in the house of a certain William Harrison of the said parish, when they found "in the hall" of the same house "a dagg" charged with powder and ball and "a fowlingepece" also charged with powder and ball, with which weapons they played in ignorance that the dagg and fowling pece were loaded, Richard Carpenter having the fowling pece and Thomas Goldston the dagg; and in so playing Richard Carpenter unintentionally and by mischance shot Thomas Goldston in the face, so that he died instantly. On his arraignment Richard Carpenter put himself Guilty by mischance GDR 
Here http://www.learningcurve.gov.uk/tudorha ... lochlw.asp
How likely/common was this kind of thing? and what's a dagg?