If you think about a trap or skeet gun the essence of shooting accurately is mounting the gun over and over so it always mounts in the same position on your shoulder, where our face plants on the stock, how cocked your head is (held high or leaned down into the gun) where you place your hand on the forearm, etc. If you change any dimensions of the gun, wear a glove, add a few layers of clothes or fundamentally change your mounting positions you will feel the gun differently. The balance in relation to your body will change, it may kick more, it may slap your face, etc.
If you have a t-shirt on and mount a gun it will fit one way, if you are wearing 3 layers of clothes it will mount differently. That will throw your shooting off until you shoot it enough to compensate for the added LOP. It is the same for DAH, DAC and cast. If you have some agility in your arms, neck and head you can compensate for some but not all the factors. Some people because of their build and or dexterity are unable to compensate and poorly shoot guns that do not fit.
It is best to find or have measured for you a gun that fits best and when you purchase a new gun try to keep those dimensions within a small range of those measurements.
I have a Greener with a 13.5 lop which is too short for me. If I add a few layers of cloths it matters not. I still try to mount it in the same way as my other guns, my face lands on the wrong place on the stock and I get kicked in the cheek. I don't shoot it enough to train myself to compensate for the difference in LOP.
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