Granulate backstop assembly

A projectile trap for capturing projectiles, the trap comprising:

• a support structure including an inclined support surface that is inclined relative to horizontal;
• a particulate flowable granular material supported by the support structure, at least a portion of the granulate material being disposed above the inclined support surface such that the inclined support surface is substantially covered with granulate material, the granulate material being adapted for slowing down and capturing the projectiles;
• and
• a non-flow-through retaining trough positioned in front of a lower edge of the inclined support structure for accumulating particulate material that flows downwardly from the support structure, the retaining trough including a floor below which the granular material is not free to pass, the retaining trough also including a front retaining wall extending, across a front of the projectile trap, at least some of the granular material engaging the front retaining wall such that the granular material is retained behind the front retaining wall, the front retaining wall having a height substantially shorter than a height of the projectile trap.