This is how you build Dracula

So if you want to maximize the effects of Created Momentum to shoot a created weapon with almost infinite momentum the warp sphere talents you'll want are Object Teleport, Wormhole, Flex Space, Distort Size, Extradimensional Storage and Extradimensional Room to make this a little easier.

The Creation Sphere talents you'd want would be Permanent Creation, Created Momentum, Replication, Expanded Materials (To make it out of something strong and hardness penetrating).

You'd want the time sphere, Afterimage, and Improved Afterimage so you have an extra move and swift action each round, to facilitate the combos execution. This means you'll need to be 9th level at least.

Finally you'll want the ability to cast the Permanency ritual, and the ability to spellcraft.

You would create your extradimensional room as a long, straight hallway. Length would depend on caster level. You do not need to create the portal near you, thanks to Extradimensional Storage. You would then spellcraft a spell that combines Wormhole, Flex Space and Distort Size to place a wormhole just inside the entrance of your Extradimensional Room and at the other end of the hall, creating a looping portal. You would use Flex Space to have as much space between those points be counted as twice the distance. Then you would use Distort Size to cause the object to be considered as if it were traveling twice as fast, multiplying the distance travelled by 4x.

You would permanency that spell inside of your Extradimensional Room.

Then, you would cast Replicate, creating a weapon that would be appropriate, likely a spear, ballista bolt, or cannonball with created momentum that will propel it to the other end of this extradimensional room and through the wormholes, infinitely. Every round, another will be created, creating infinite ammo, gaining an infinite amount of momentum. You would then be able to use a move or swift action (if you expend a spell point) to take any unattended object from within.
Note, this costs like, 2500 gp of diamond dust per level of the affected spell. So it's not CHEAP

It does also cap out the way falling damage does. But you could have a Large weapon function with this, since a Large 2-handed weapon still only occupies a 10ft length of space. You could probably do a Huge spear even, but not a greatsword. So you could feasibly create an infinite number of 8d8+60d6 Ballista Bolts, which you could fire as a move action, swift action and standard action.
And I just realized that because the fall damage is capped based on distance, you could also widen the extradimensional room to allow for even larger things.
If you create it out of harder materials, it does double damage. And if it has traveled more than 150 ft, it does double damage. Falling damage specifically
So it would do... 240d6?
If made of something harder than stone.

The only saving grace here is that damage is capped at 20x the d6 of the object's falling damage after traveling 200ft, before multiplication. But... that's really not much consolation.