Thanks for the quick answers.

Well my decision was that the player can add Correspondence to affect
more than one weapon/bullet or Matter to enchant the material. But I
ask that she must paid quintaessence for every bullet. She wanted to
enchant 1000 bullets!!!!!
Gosh, she wanted to go to the local supermarket, buy a big box of
bullets and encanting the thing, with the bullets inside.

I also allow the gun to be enchanted with Forces 3 and Prime 2. But
paying extra quintaessence, one per bullet.

I wrote for my players a long explanation about how I see the problem.
MaGnUs you can read about that in the Forum I use for our games.

I will ask for handcrafted gun or bullets. To make it more personal,
and because we do not want k-mart magic bullets (thanks for the idea
Chris).

Yes, you know the player MaGnUs, is Tiamat. But don't say to her that
I asked for help ;-)

MaGnUs: are you sure that it is not vulgar?. I have Akashik Brothers
kicking agravatted, is that vulgar??. Do you have any reference.
I said to my players that I take enchanting terrible damage dealing
weapons as coincidental when doing agravated damage. But I said that
enchanting small knifes, .22 guns and kicks for agravated damage is
asking for paradox. Was I wrong?.

Thanks again
Paco