Laser Trace Round?

This is an interesting idea.

Lasermax has a recoil rod laser that replaces the recoil rod for some semi automatic pistols. I have a Springfield Armory XD45 that has one of these, and it sits just below the barrel, and uses a 660 NM flashing laser that never needs alignment, as it is always in aligned with the barrel.

I am thinking that mounting a 445 nm or 405 nm laser just below the barrel, with a minor adjustment so that the laser will hit the bullet between 20-50 yards would be do'able. The mount would probably have to be some sort of custom job, and adjusting it would take quite a few shots to find that sweet spot where the laser hits the back side of the bullet before the trajectory drops, and your eye can recognize the light for what it is.

Now, I reload my own rounds at a friends place who has all the equipment, and so painting the back side of the bullet with a phosphorescent type paint would be possible, and it would really show up as visible with the lower NM type but depending on the type of powder you use, it might get a little dirty from the burn, so black powder vs a smokeless would have a big difference in visibility.

I'd love to see this done.

The mount is going to be completely custom, cardboard shims and electrical tape
Its more of a want to see it done and see how cool it looks sort of thing. No real practical application so I probably wont rig up anything permanent.
I'm thinking put it on the left side of the barrel and have the left edge of the fast axis divergence path run parallel with the bullet or close to it, the right side would then come on over in to the bullets path. I think it will only work at dusk though. In broad daylight it wont be bright enough beyond a certain range due to the divergence required, but of course in pure dark, the beam, even in spotlight form, is plainly visible.