The support hand should be providing the "firm grip". The shooting hand shouldn't be firm, more of a hand shape grip. Gripping hard with your shooting hand will not allow you to squeeze the trigger without disturbing the sight alignment.
Try relaxing the grip somewhat with your shooting hand and using a firm grip with your support hand.
A firm grip will not slip. If it does, then you need to work on your hand strength.
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Kraig Stuart
CPT USAR Ret
USAMU Sniper School
Distinguished Rifle Badge 1071
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