Why are my projectiles passing through my mesh floor?

I am making a game from the Third Person template. I have copied the projectile blueprint from the FPS template. I need my projectile to bounce off of the ground in the same way that it does from the Meshes in the FPS template. I have converted my BSP to a Mesh and copied the settings from the FPS meshes but my projectile still falls through the floor about 70% of the time. I have also tried using a blocking volume and this has not helped either. Any help would be appreciated.
I have included screenshots of my mesh and projectile settings.
Mesh:

Projectile:

Thanks in advance.

Edit - I have now inserted a new blocking volume and am getting about 50-60% success, the rest of the time the projectile falls through the floor.

I used to have that problem allot. Along with a ton of other problems, like the projectiles sponging, or glitching movement when they spawn in, all kinds of things. In addition the simulate hit felt extremely buggy. What I have moved over to now is having my projectiles use a line trace on them, That way the hit is less buggy. I just put an arrow on my Rocket in this case, and angled it slightly down about 10 degrees so that it would be able to hit the ground and not trigger the initial spawn hit clause. I Used 3, so I could get to either side as well, rolls always go to the attacker… XD.