Sounds like...
You are anticipating the shot. If your sight alignment and sight picture are good to go, then you might try some slow dry fire exercises. This will allow you ample time and opportunity to recognize this issue. The good news is that it is fixable whatever you discern the problem to be. This is something that you train and train and train some more to recognize and eliminate. Slow is smooth, smooth is fast and even the best gunfighters out there dry fire daily to reinforce good technique and smooth away rough edges and training scars.
~Str8
I come in peace, I didn't bring artillery. But I am pleading with you with tears in my eyes: If you **** with me, I'll kill you all.
Marine General James Mattis, to Iraqi tribal leaders
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