Question About Accuracy

No, not this.

If I experience an error in point of impact, the bullet impact will almost always be 1 to 1 1/2 inches left of center (Usually near center vertically).
My question is: Why the tendency for the bullet to strike left of the target with such frequency, regardless of the type of firearm?

OP states that it's regardless of various firearms, pointing to a random error in his shot going off occasionally to the left.
This is not a sandbag sight in error, it's a shooter error.
Otherwise he would be shooting consistent tight groups all to the left.
OP is asking why the majority of his errors is always to the left, I believe.

This is not corrected by shooting off a sandbag.
 
The only sure way to test the true accuracy of a firearm is to test it in a machine rest.. The way factories do handguns is a machine rest..The best known and used is the Ransom Rest..
 
This was my original statement:

If you are consistant, that is, getting good groups, then your sights need adjusting. Move you rear sight a couple of clicks right windage and see if that doesn't solve yor problem.

And here is an example:



The first target, on the left, is the very first firing I did with my new Ruger. As you can see, group was off to the left. After making some adjustment in the rear sight, target on the right was centered, except for three wild shots.

Bob Wright
 
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