Cannoneer #2 loads the propellant into the cannon tube and ensures it is seated past which feature?

• A. Muzzle Ring
• B. Swiss Groove
• C. Breech Block
• D. Elevation Gear

Answer: (B)

The important idea is getting the propellant to sit at the correct depth inside the bore so ignition and pressure develop properly. The Swiss Groove inside the barrel acts as a depth stop or reference point for seating the charge. When the propellant is pushed far enough to be past this groove, the powder column is fully contained within the breech area and pressed against the proper surfaces, allowing the breech seal to close correctly and the primer to ignite the entire charge reliably. If the powder were seated short of this groove, you could get improper obturation, gas blow-by, or incomplete ignition, leading to unsafe or inaccurate firing. The other features listed are external to the seating depth and do not define how far the charge must be advanced into the tube.