I went through the same process with my Sig 2022 and found a) My finger placement was nearly perfect (off by a little; the right edge of the trigger--and this is decocked--lay right down the first bend in my finger) b) the gun still felt better. Actually, it feels pretty great.
Just a quick follow-on: For most people and with most semi-autos, you don’t want the trigger aligned with the first joint of the forefinger (technically, the joint formed by the distal and middle phalanges). You typically want the trigger right in the middle of the pad of the first finger bone, the distal phalanx. The exception here is usually for DAO triggers that are very heavy and have a very long pull.
If you go to the link Andy posted of his write-up from a couple of years ago (
Trigger Length – Why It can Affect Your Accuracy), you can see the reason for this.
None of our joints move in a straight back-and-forth motion: everything is radial; everything rotates in a semicircular motion from a pivot point. The way we achieve (nearly) straight movements is by combining two or more joints into the same motion. For example, if you want to push a barbell straight up off your chest, you’re combining the radial movements of the shoulders, elbows, and wrists to accomplish it.
In the case of a trigger, the straightest possible path, one precisely in line with the axis of the barrel, is the best possible path. It makes sense: You’re applying pressure while wanting the keep the POA alignment of the barrel perfectly steady. If the pressure is applied absolutely parallel to the barrel, the barrel won’t change its horizontal alignment; if the pressure is applied with any sideways force, the barrel is subject to a change in its horizontal alignment.
Here’s an experiment. Stick you hand out in front of your face so that you’re looking edge-on, at the outside of your index finger. Trying to keep everything else in a fixed position, move the second joint only (the joint formed by the middle and proximal phalanges). Since the finger’s first joint is closer to the second joint than is the pad of the finger, it moves in a tighter circle than does the fingertip. It’s this second joint that sees the most movement when pulling a shorter trigger; the second and third joints combine more to achieve a very long trigger pull.
Actually, John Farnam teaches this sort of isolated finger movement as method for practicing trigger control that can be done virtually anywhere. Relax your fingers and thumb a bit—but leave them only slightly bent, not closed as if around a pistol grip—and then pretend you’re slowly pressing a trigger in a perfect straight-back motion; don’t allow movement in any other finger, and strive for a perfect, smooth press-back. You’ll quickly see how tough it is to actually accomplish.
Odds are, the press won’t be perfectly straight back, and it won’t be smooth: you’ll probably see fine-motor control issues and your trigger finger will move a little jerkily, not smoothly. It’s easier to do when our other fingers are anchored, as around the grip of a gun, but if you can control a perfect trigger press in an exercise like this, then you’ll be perfection when it comes time to do the real thing. (BTW, this little exercise can also help the recoil-anticipation grip-tightening that Jeff mentioned.)
That’s the long and short of it...pun intended. For a shorter-pull trigger like a 1911 or most striker-fired pistols, you’ll want to work from the center of the fingertip pad to achieve the most perfectly straight-back press you can. Even if you have very large hands, the temptation shouldn’t be to put too much finger on the trigger and move the contact point to the first joint of the finger. Mechanically, you just can’t achieve as flat a press with the first joint.
With very long, heavy trigger pulls, it may be necessary to move trigger contact to that first joint. And generally speaking that’s why I don’t advise a shooter with small hands to start with a large DA/SA autoloader like a 92FS, or a large-frame revolver like S&W’s N or X frames. Not that they can’t learn to shoot them well; it’s just that learning good trigger control on a shorter-pull trigger is going to be easier, and reward the shooter with better accuracy more quickly.
As always, just MHO. I am not a lawyer or expert of any kind (IANALOEOAK).
Here’s somebody who knows much more than I do (
Il Ling New was Gunsite’s first female instructor, and has taught there for many years; however, I’m not a fan of her thumb placement for semi-autos; fine for revolvers; but that’s just me...):
[youtube]
http://youtube.com/watch?v=JLVjBq28A84[/youtube]