It's a question that we went back and forth with for awhile ourselves many moons ago. The "how" and "why" of our conclusions may be of some interest. Whether or not anyone agrees with them, well at the least you'll fully understand the basis for them.
The question is this:
Why does Fairbairn stress the straight thumb in line with the barrel, even for one handed shooting?
Years ago when we first began our attempt to sort out the mechanics, methods and reasoning behind this type of shooting we had the exact same question! It really is an excellent question.
We need a little history here. When a group of us started to "experiement" with this method of shooting we had all been indoctrinated and trained in one or both of the prevailing "practical" shooting methods extant. One being the "cutting edge method" of the time, that owing to Jeff Cooper and the methods being taught at Gunsite. The other being the fairly standard FBI clone known as the "Practical Pistol Course". Most police recruit training of this period emphasized the PPC tactical course of fire over any other method, including the much touted "Weaver". Full sight alignment, "positive" grip with a two-hand "isoceles", barricade firing with both single and double action(most departments carried wheel guns) all done at varying distancesand various battery firing positions. The only time ANYTHING approaching "instinct" shooting was even mentioed was at the six foot range distance when passing commentary went something like......."Maybe you won't be able to get the gun all the way up, so..............."
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