Can Solenoids Enhance Railgun Performance?

[Waterfox]

I haven't seen any discussion or any mention what so ever of this before so excuse me if it's that's because it's a crazy idea.

What would be the pros and cons of using solenoids as the rails and projectile of a railgun?
Would the stronger magnetic field of the solenoids allow a stronger force to be applied to projectile or is it a simple case of you get the same amount put out than you do put in regardless of being a rail or coil.
I just tried building simple one connected to a battery and it worked, both with a solenoid projectile and ball bearing. (I took vids if you'd like me to post them)
Discussion?

 

[cragar]

Was your projectile inside the solenoid.

 

[Waterfox]

No, the rails were replaced with solenoids.
Here are the videos to help you understand:
https://www.youtube.com/watch?v=fRZd9-OlZ68

https://www.youtube.com/watch?v=9GYGwN9zHD0

Here is a copy of the description for the first video:

Trying out the idea of using solenoids instead of rails. The side rails and the projectile are both solenoids. I used enameled wire wrapped around some bolts then sanded the outsides to ensure a connection. The battery is a 2S LiPo, I made sure to constantly check it's temperature and it barely got warm.

Some info:
The projectile was attracted to the "rails", this helped to keep the connection.
Adding to this, rails (solenoids) and the projectile (also a solenoid) were all attracted to each other rather than being repelled (I believe this is how a traditional railgun behaves).

 

[cragar]

Im trying to figure out how this works Because the B field outside the solenoid is zero.
There is a pretty small fringing field. Is this DC current, it looks like it from the video.

 

[Waterfox]

It's connected to a 7.4v Lithium Polymer battery so it's DC.
Here's how I imagined the magnetic poles, green is the rails, blue is the projectile.
[PLAIN]http://img690.imageshack.us/img690/5193/railgunq.jpg