If you want to have a truly accurate reading of what your trigger pull performance will be, tape a very small laser pointer either along the barrel or on the butt. It doesn't matter if it is aimed properly, you just want to see the movement. Set up a target and dry fire using the target and whatever sighting system you plan on using.
Set up your phone, tablet, whatever you own, to record a half hour or so of dry firing with the laser showing exactly what your trigger pull is doing to your point of aim all the way through the sequence. If there is a spot when you yank your gun off of point of aim by a few degrees, you will now know exactly what is happening.
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