It will be well at this point to discuss what are known as „class characteristics," as the term applies to rifling. Class characteristics are those features which, because of the differences laid down in the specifications of different manufacturers, will (if actually followed in the processes of manufacture) often give a promising clue to the make and model of the gun from which the evidence bullet was fired. These characteristics are:
1. The land (bore) and groove diameters
2. The direction of the rifling twist
3. The number of lands and grooves
4. The width of the lands and grooves
5. The degree of twist of the rifling
6. Depth of grooves.
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