If i insert a laser bore sighter into the bore of the rifle and adjust the eotech so that the the laser bore sight beam and the dot on the eotech converge, will my rifle be correctly sighted on the target I am looking at?

In theory yes but in practicality no.

 

The laser has to be marking a line that is perfectly parallel to the center of the bore.

 

You nee to be able to do it at the range you want it zeroed at. Most bore sight lasers aren't powerful enough to be seen well during the day, let alone at distance.

 

the laser will not take into account spin drift. At close range it wont be much but its there, and a long range its noticeable.

 

It will get you decently close but you will still need to shoot it in.

It will get you decently close but you will still need to shoot it in.

This is the most important part. A bore laser will get you on paper at a reasonable distance, but not zero'd in. If you have one available to use, then go for it. If you're looking to purchase one, it will most likely be cheaper to start out close, and walk your way out to your desired distance.

Are there any plots available that show the trajectory of 7.62x 39 round at various distances when fired form a Saiga or similar weapon?

If its not written on the package, there are a couple ballistic calculators online. You will need to plug in barrel length, bullet velocity, sight height over bore etc.

Are there any plots available that show the trajectory of 7.62x 39 round at various distances when fired form a Saiga or similar weapon?

It's going to be specific to the round you use, most manufactures have charts set up for how much a bullet will drop over a set distance and the velocity at said range. The issue, like stated, is that every gun shoots differently depending on the barrel, length, twist rate, if its FF, is it a heavy or light weight barrel the material of the barrel, many many factors, like said you will always get a ballpark estimate, but you will have to make fine adjustments unless your a mathematical wizard and understand every aspect of your barrel and the ammo you use.

 

PLUS, you have to take into consideration weather conditions. Due to wind resistance no 2 bullets will ever follow the same exact trajectory, close but not the same.