With the advent of the magus and spellstrike, I figured I'd ask this question:
What is the threat range of a held touch spell when its delivered by an unarmed strike or natural weapon?
To whit:
PC1 has improved crit touch spells, improved unarmed strike and punches to deliver a held shocking grasp. Is it a 19-20/x2 or a 20/x2?
PC2 has improved crit: claw, a claw natural attack and claws to deliver a held shocking grasp spell. Is it 19-20/x2 or a 20/x2?
PC3 has a 20/x3 natural attack and uses it to deliver a held shocking grasp spell. Is it 20/x2 or 20/x3?
Whatever answers apply here should likely apply for the magus' spellstrike baring a rules exception for them.
-James