red dot question

[pokeyman]

I have a red dot on my rifle that is zero in but when my friends shoots my rifle everything is off to the left. I am wondering why is that?

[gun fu]

If the rifle is at mechanical zero, Likely the difference in trigger control

[dieselpower]

If the rifle is at mechanical zero, Likely the difference in trigger control

this is mostly the case if one shooter is on-target and another shooter is off-target.

The hold style and trigger control play more into accuracy then most people think...even the ones who know trigger control is an issue still don't get how much of an issue it is.

[postal]

Actually, assuming that both shooters are experienced, and know what they're doing, it's because the shape and size of your head compared to theirs.

The rifle is setup and dialed in for you. For where *YOUR* eye ends up in relation to the stock. Other people will be close, but not perfect alignment...

Same happens scope/red dot on a rifle.

With a scope/RDS, your eye is one point, the dot/reticle the * single * other point, and you line them up to the target.

Irons, your eye is lined up on 2 points -front and rear sights, which get lined up to the target.

There is no shift in zero for irons, but there is for a scope or red dot.

[SNCaliber]

yup for your own personal rifle, you always zero it yourself, so it may vary per person

[dieselpower]

I hate to break this to you guys, but No... a rifles zero doesnt change due to the size of your head or even where your eye views the dot. Unless you are using the edge of the optic then there is no parallax.

Its in how you pull the trigger...period end of story. Some people use the meat of their finger, some the crease between joints, some hold high some hold low. It all determines your shot placement.

The shooter is thinking he/she is pulling the trigger while the dot is on the target, but by the time the FCG releases the hammer the dot has moved off.

I have proven this by locking a rifle in a vise so hard, it can't be moved. I told my student to look through the Aimpoint and pull the trigger. he was under 1.5 MOA around the X- Ring for the whole magazine. I took the rifle off the clamp and let him bench shoot off a rest and he was 3"+ low and right...