IMO, Randall gave you the right answer. I shoot mainly double trigger guns. I also shoot relatively short LOP guns(14") If you place your trigger hand as far back on the grip as you can, so you can just reach the front trigger with the tip of the index finger and keep it there, you will eliminate this problem. You will also eliminate the middle finger getting whacked by the rear of the trigger guard. I respectfully disagree with the idea that a longer LOP will fix it. No matter how long the pull is, you still have a big bend in your arm at the elbow, and your trigger hand can still be in the wrong OR the right place. A longer LOP is the usual answer that pops up for this question but I believe it has nothing to do with it. Where you place your hand is the key. If you also put a little tension on it, pulling the butt against your shoulder, that will help keep your hand back. I still get careless, sometimes, and let my hand get whacked by the trigger guard. However, if LOP was the problem, I'd get whacked every time.
