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If your regular chance to hit is 34% or greater (19% for Rapid Fire), it is always better to use Rapid Fire. The chance to hit at least once while rapid firing with regular accuracy at 34% is 1-(1-0.34-0.15)²=0.3439 or 34%. The chance to hit twice is only 0.0361 or 3.61% under those conditions. Using Rapid Fire at lower accuracy leads to a decreased chance to hit at least once, but the potential for hitting twice may make it worthwhile if the alternative is to let a strong enemy have a chance to attack.

One circumstance where you may want to abstain from using Rapid Fire is when your soldier may not have enough ammo to last through the engagement. Note that you will not waste ammo if the target dies on the first shot.

If your regular chance to hit is 34% or greater (19% for Rapid Fire), it is always better to use Rapid Fire. The chance to hit at least once while rapid firing with regular accuracy at 34% is 1-(1-0.34-0.15)²=0.3439 or 34%. The chance to hit twice is only 0.0361 or 3.61% under those conditions. Using Rapid Fire at lower accuracy leads to a decreased chance to hit at least once, but the potential for hitting twice may make it worthwhile if the alternative is to let a strong enemy have a chance to attack.

According to Invader Skoodge's graph, both options will do the same damage at 30% accuracy, and above that Rapid Fire will get progressively stronger. Therefore, if your target can be killed in 1 shot, use Rapid Fire if your accuracy is 34% or more, if the target can't be killed in 1 shot, Rapid Fire is viable at accuracy as low as 30%.

One circumstance where you may want to abstain from using Rapid Fire is when your soldier may not have enough ammo to last through the engagement. Note that you will not waste ammo if the target dies on the first shot.

If your regular chance to hit is 34% or greater (19% for Rapid Fire), it is always better to use Rapid Fire. The chance to hit at least once while rapid firing with regular accuracy at 34% is 1-(1-0.34-0.15)²=0.3439 or 34%. The chance to hit twice is only 0.0361 or 3.61% under those conditions. Using Rapid Fire at lower accuracy leads to a decreased chance to hit at least once, but the potential for hitting twice may make it worthwhile if the alternative is to let a strong enemy have a chance to attack.

If your regular chance to hit is 34% or greater (19% for Rapid Fire), it is always better to use Rapid Fire. The chance to hit at least once while rapid firing with regular accuracy at 34% is 1-(1-0.34-0.15)²=0.3439 or 34%. The chance to hit twice is only 0.0361 or 3.61% under those conditions. Using Rapid Fire at lower accuracy leads to a decreased chance to hit at least once, but the potential for hitting twice may make it worthwhile if the alternative is to let a strong enemy have a chance to attack.

One circumstance where you may want to abstain from using Rapid Fire is when your soldier may not have enough ammo to last through the engagement. Note that you will not waste ammo if the target dies on the first shot.

If your regular chance to hit is 34% or greater (19% for Rapid Fire), it is always better to use Rapid Fire. The chance to hit at least once while rapid firing with regular accuracy at 34% is 1-(1-0.34-0.15)²=0.3439 or 34%. The chance to hit twice is only 0.361 or 3.61% under those conditions. Using Rapid Fire at lower accuracy leads to a decreased chance to hit at least once, but the potential for hitting twice may make it worthwhile if the alternative is to let a strong enemy have a chance to attack.

If your regular chance to hit is 34% or greater (19% for Rapid Fire), it is always better to use Rapid Fire. The chance to hit at least once while rapid firing with regular accuracy at 34% is 1-(1-0.34-0.15)²=0.3439 or 34%. The chance to hit twice is only 0.0361 or 3.61% under those conditions. Using Rapid Fire at lower accuracy leads to a decreased chance to hit at least once, but the potential for hitting twice may make it worthwhile if the alternative is to let a strong enemy have a chance to attack.