Quote
Originally posted by Todd:
Hmm... back to Home Depot I go! Good thing you can return cut wire there...


Although 8 on a 40 would have been safe... I don't want to be tripping breakers while trying to cook dinner.

Thanks for everyones advice!

On a purely resistive load such as this, the smaller wire would result in voltage drop and lower wattage available to cook. This would not cause the breaker to trip.
BTW,
Voltage drop at a full 40 amps(unlikely)on the # 8 will result in 236.2 volts at your range.
#6 will deliver 237.2 volts.
I'm not sure the excahnge, and the extra difficulty working the #6 is worth the time& effort.