The issue you will face will not be what ammo you use, but why the ammo you used to defend yourself was different than the ammo you shoot every day at the range. The Crown will imply you planned to use your gun to kill an attacker by buying special "defense ammunition". Crown will imply, and likely provide proof, that the "defense ammo" is more likely to cause death than standard ball ammo you shoot at the range. All the makers of "defense ammo" will back this up in their literature. The graphic photos of the tests comparing this to ball ammo will be shown as evidence of excessive force.
If you load for defense and are concerned about the legal after effects more than saving your life, or the life of loved ones, etc, load your range ammo.
If you have a real situation where your life is in danger, or your child/wife/etc is in danger, you will thank god for the opportunity to see a courtroom.