The brother of Ranger Michael Maguire, who was killed on a range in Pembrokeshire, said "soldiers should not be killed in training, and we hope that lessons are learned army-wide to ensure that an incident like this will not happen again."
The jury at an inquest in Cardiff recorded a verdict of unlawful killing.
Jimmy Maguire described Ranger Maguire as "a dearly-loved son and brother, much missed by his family and everyone who knew him."
An inquest recorded its verdict after hearing Ranger Michael Maguire was hit by a stray bullet when targets where set up in the wrong place.
An inquest into the death of Ranger Michael Maguire, 21, who died at an army range in Pembrokeshire, has started today.