Interesting points all around. Thanks for the video, Surf! I have a lot of dry firing ahead of me!
Patrick McNamara and Paul Howe both advocate putting as much finger on the trigger as possible. Pat mentioned it in his book T.A.P.S. (he says he learned it from a friend with AMU), and Paul has mentioned it in both of the classes I've taken with him.
I don't shoot a wide variety of guns, so my finger position seems to stay pretty constant. I don't vary it from DA to SA shots either, at least not that I've noticed.
I do vary it when I'm shooting WHO or SHO, in both of those times, I find that more trigger finger is better for not pushing shots left or right. That has been a big problem for me in the past.
Yesterday I played around with more finger on the trigger like I used to use. Didn't like it. Same as before - it seems like my finger pushes more laterally, and the grip change that goes along with it makes the gun track a little diagonally. Seems like I end up with a few more high right and low left shots, despite the leverage I gain on the trigger.
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One hand only, it is also easier for me to finish flat on the trigger with less finger.
Likes pretty much everything in every caliber.
I was shooting with Chris Rhines last week and he made a helpful observation regarding my trigger finger placement. After observing one of my groups at 25 yards printing left, he suggested using more of my finger on the trigger. I've been conditioned to use the tip of the index finger, but his suggestion proved to be correct.
Fred, I think trigger placement falls into art not science, and may vary by platform and shooter's hand size. What doesn't vary, is the need to finish flat with the trigger. However you got there with your pistol and hands is what I would be looking for. Part of that is finger placement, but part is also how you work the trigger. For example, pulling and rolling are different for me. I also think a lot of discussion goes into the start of the press and not enough in the finish of the press -- which is the part that ultimately matters.
I think the Wayne Dobbs drill is a great way to isolate the press.
Likes pretty much everything in every caliber.