Don't forget about the DA/SA transition under stress. I don't mean only life and death stress either as competition effects me worst than others. Myself and severals friends and acquaintances noticed a low high pattern (in the first two shots) of hits on the target while shooting DA/SA weapons during competition that wasn't there with a DAO or SA guns. I was shooting a Beretta 92 at the time and when I started hammer down the first shot was always low and the second almost always very high. Subsequent rounds were well centered. This started us wondering why as it didn't happen in practice even at speed. We concluded that it was a phenomenon caused by stress. We figured that the brain, while on auto pilot, would give the same amount of pull needed for the first shot, to the second shot. I can only imagine how low and high they would be under life and death stress.
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