Just GMed my first session of T20 the other day and a question came up whilst the PCs were busy being eat up by a Frost Worm ... one of the PCs took aim with his trusty rifle and made a called shot into the beastie's mouth.
I ruled that the called shot enabled him to bypass the worm's natural AR (5, half it's natural AC of 10), which meant that in two well-placed shots he had reduce it's Lifeblood from 20 to 0, whilst it still had 100+ Stamina (in hindsight I would stick to doubling the creature's CON to get its Lifeblood).
Is that a reasonable use of a called shot?
I ruled that the called shot enabled him to bypass the worm's natural AR (5, half it's natural AC of 10), which meant that in two well-placed shots he had reduce it's Lifeblood from 20 to 0, whilst it still had 100+ Stamina (in hindsight I would stick to doubling the creature's CON to get its Lifeblood).
Is that a reasonable use of a called shot?