WEAR AND DAMAGE OF SHOTGUN BARRELS WITH PELLETS OF SOFT IRON AND LEAD - A FINAL REPORT.

The final series of experiments is described in which measurements are made on the wear and damage done to the barrels of superimposed and side-by-side shotguns, from which lead and soft iron were fired. A considerable amount of damage had occurred with the soft iron during the firing of 300 rounds or less, and subsequent firing of 700 rounds caused less severe damage. The lead pellets caused a measurable amount of wear but not of the same magnitude as the soft iron.