I dunno the fact that your finger is on the trigger is pretty stupid and you should rethink finger location next time. If your finger is on the trigger you better be ready to light off a round regardless.
As for in your car taking the pic...no biggie you are most likely parked in your driveway so I see no harm in it...though it probably isn't the brightest idea.
Don't give the Cali gun control freaks any ammo to use if possible when it comes to "the need to control gun ownership in a stricter fashion" just not something we need to deal with.
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"I'll keep my money, guns and freedom. You can keep the "Change."