Double 1? I'm not sure what you mean.
Template weapons don't use the same hit or miss mechanic of other weapons, instead if you're attacking with a template weapon and you miss by more than the base damage of the weapon that attack does no damage, but still hits.
So in your example of a trooper with 7 RC and a 7 damage template weapon (BTW what has this , LI grenade Launcher?) with the same modifiers as Enker proposed: -3 cover, -3 smoke, -4 panic and -4 range, the total modifier to RC is -14 so 7-14=-7, therefore even on a roll of 1 you would do 0 damage.
At least thats how I see things. Joe, any thoughts?