Question: Artillery Plotting Without Actually Firing Guns

[DRG]

If your FOO has eyes on the target then certainly using one tube as a kind of spotter round if you are conserving rounds is perfectly acceptable and then when you have the enemy units in your field of fire you can use all tube as a "fire for effect" mission

Fire for effect is a military term. According to NATO doctrine: Fire which is delivered after the mean point of impact or burst is within the desired distance of the target or adjusting/ranging point. Term in a call for fire to indicate the adjustment/ranging is satisfactory and fire for effect is desired.