This looks like an excellent training tool. Thanks very much for your time and effort. I do have a question: What is the difference between "Tightening grip while pulling Trigger" on the lower right and "Tightening fingers" on the lower left?
Love this target!
We know every contact point of our hands applies some amount of pressure on the pistol, and that pressure causes the gun to move, or not move, in a certain direction at a certain time, and those pressures can change throughout the trigger press.
In addition to trigger control effects . . . .
The first, if you're hitting there, may be your strong side thumb applying a bit more pressure in your grip than you want, causing your wrist (and gun) to roll slightly down and right. You may also be applying too much rearward and downward pressure with your support hand fingers, if you are shooting a variant of a thumbs-forward grip with your support fingers wrapped around your strong side fingers under the trigger guard. Try this (this is
NOT a fix, you're trying to
create the error so you can better realize it and then fix it) - - with your cleared and unloaded gun
- - grip the gun loosely in your strong hand, and
just squeeze in and forward with the thumb, you may notice the muzzle go down and right. Now apply your support hand, loose grip still, and
just pull down and across to the right with your fingers, gun will do the same thing. Now be aware of these pressures when you shoot.
The second, your strong side bottom three fingers may be putting a bit more pressure in your grip than you want, pulling the muzzle down and left, or your support hand fingers may be over-tightening in, gripping too tightly, which flexes your strong hand to the left and down, which may be pulling your muzzle the same way. Try this, no gun needed (again, not the fix)- - extend your strong hand out, one finger pointing out, thumb up, bottom three fingers slightly curled (make a gun). Relax your hand, then squeeze those three bottom fingers in, and see where your trigger finger goes - down and left. Too much pressure with them during your grip does the same thing. Now add your support hand, keep your strong hand relaxed, and just squeeze in, down and left, with those support side fingers. You may notice a down and left pull on your strong hand. You might also notice your support side wrist flexes up and right, which may drive the back of the pistol up and right, so the muzzle down and left.
The fix is being aware of these pressures, and noticing them in your grip, then letting them up until your grip balances and your hits are true. Watch that front sight as you fire, it will tell you everything before the round hits the paper. Works with dryfire, too.
IMO, grip is all about balance, finding the right amounts of pressure and balances between fingers, thumbs, palms, strong/support side, all that, that works best for YOU.
Good luck!