The 11 degree forcing cone was first developed to help out the accuracy of bullseye/PPC revolvers shooting wadcutters. Looking at the revolver pictured, I'd expect the included angle of the forcing cone to be way down on the list of possible mechanical issues affecting accuracy. There are a whole of other potential issues with a greater effect upon accuracy. [Cylinder throat diameter, end play, cylinder carryup, ranging, yoke alignment...........]
If VERY carefully done, it can smooth out eroded/pitted forcing cones. But, it's a very delicate operation and involves the use of gauges to make sure you don't wallow out the forcing cone (cut it oversize in diameter). Doing it right can involve setting the barrel back. It also may or may not improve the mechanical accuracy of the firearm.
Let's be honest. The greatest detriment to accurate handgun shooting is generally the person holding the handgun.
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