Question about trigger control

[TF89]

Just a general question that will help me, my subject states trigger control, actually my question is regarding effect on POI and trigger pull.  In archery a lot of information can be gleaned from how the arrow impacts a target.  Can the same be said about trigger pull?

If a right handed person has pellets impacting the same height vertically but are stringing left horizontally.   Or the reverse pellets string to the left of POA.  I would assume there are a lot of variables, what I'm looking for in a answer, is ff the shot is being pulled which direction is the most likely based right or left handed shooter?

Thank you,

Dave

[TF89]

So then I use the power of google and find this.
Horizontal shot stringing from rifles so shot is common when the rifle's not pulled back into the shoulder the same way for each shot. There's also a shift in windage zero from sitting at a bench to standing up on your hind ligs; shots to to the right more so when at the bench.

If the rifle's trigger has a really heavy pull, the impact of the trigger finger transferred to the rifle when the sear's released and the finger lever comes to a hard stop is quite a force. If that force is not in line with the bore axis, it'll pull/push the rifle to one side. Good way to see this is dry firing and watch were the scope's reticule moves when the firing pin snaps home. If it jumps left for a right handed shooter, the trigger finger's not far enough onto the finger lever; it pulls back at an angle from right to left. If the trigger finger's too far in, it pulls the rifle to the right moving the recitule that way when the firing pin snaps.

One sure way to have horizontal shot stringing is finger flicking when the round fires. That's when the trigger finger's unconciously told to jump off the trigger's finger lever when the sear releases. You gotta keep that finger on the trigger with it at the stops until the rifle stops moving from recoil. Practice doing this so it's second nature. Finger flickers never shoot very accurate. This is called follow through.

[Buldawg76]

I cannot answer your question on how trigger pull affect the POI but I can suggest a test that will tell you where on your finger is the best contact point with the trigger to help alleviate any trigger induced errors.

Take a pencil and place it in the crook of your shooting hand between your thumb and index finger with the point of the pencil placed on the tip of your index finger with it bent in the position it would be when contacting the trigger. Then squeeze your finger as if you are pulling the trigger, if the pencil moves rearward at an angle other than straight back the tip is not at the ideal contact point on your finger. The idea is to find where exactly on the tip of your trigger finger when squeezing causes the pencil to move straight rearward without any angle induced. Then mark your finger at the point with a vertical line and try shooting making sure that you place the line exactly in the center of the trigger blade and see if that helps alleviate the left or right POI issues.

It insures you are squeezing straight rearward versus slightly right or left biased.

Mike

[Roadworthy]

First off - do NOT dry fire a spring piston air rifle!!  Now, do not cock your rifle.  Put it to your shoulder.  Capture the target.  Pull the trigger to see how much the rifle moves and which way.  To answer your initial question - trigger pull can and does alter the point of impact of the pellet.  I think a right handed person is more apt to shoot slightly left of target if care is not taken to pull the trigger straight back.  Always pull the gun into your shoulder with the hand on the forearm, never the trigger hand.  The trigger hand is ONLY for pulling the trigger.  Use care to do so consistently every time.  Too stiff a trigger may also induce inaccuracy by causing the shooter to tremble or shake slightly. 

[Arch_E]

Too stiff a trigger may also induce inaccuracy by causing the shooter to tremble or shake slightly.

Definitely pegged me with that statement. Long trigger pulls with inconsistent breaking really introduces reflexive jerks for me. Thanks for concisely stating this, now I can work on countering it.

Archie

[WhatUPSbox?]

There are charts like this for pistols, there may be similar for rifle
http://www.targetshooting.ca/docs/grp-analysis.pdf