Time your shot so that you squeeze the trigger after your heel touches down and your foot is stepping flat that way you have a more stable position. Don't shoot between steps when one foot is in the air.
“Never give in. Never give in. Never, never, never, never—in nothing, great or small, large or petty—never give in, except to convictions of honour and good sense. Never yield to force. Never yield to the apparently overwhelming might of the enemy.”