Chris, I'm not completely sure but I think the reason why you can't get the particles to hit the surface of the can is the particle radius is 1cm - which you can't see because you haven't enabled "Show Radius" in the group settings. I think it's the outer 'surface' (radius) of the particle that's hitting the can polys but you're only seeing the center of each particle which is _by default_ 1cm away - which seems to fit the scale of your can/scene.
Note: I think you have to use a math modifier to set the radius size - setting it in the emitter or group settings doesn't seem to do anything for me but adding the math modifier to the group and assigning the radius using that seems to work great - make the radius really small and the center of the particle will get closer to the surface ;)
Chris, I'm not completely sure but I think the reason why you can't get the particles to hit the surface of the can is the particle radius is 1cm - which you can't see because you haven't enabled "Show Radius" in the group settings. I think it's the outer 'surface' (radius) of the particle that's hitting the can polys but you're only seeing the center of each particle which is _by default_ 1cm away - which seems to fit the scale of your can/scene.
Note: I think you have to use a math modifier to set the radius size - setting it in the emitter or group settings doesn't seem to do anything for me but adding the math modifier to the group and assigning the radius using that seems to work great - make the radius really small and the center of the particle will get closer to the surface ;)