REC-T-FIRE Question

[jwk]

I guess this would be a good place to ask a question about this.I have a lazer bore sighter,the bullet type.I will use this example to explain what I allready know.I have a 300 Win Mag 180gr bullet and I want to sight it in for 300yards so I look at the chart on the back of the target and it tells me that 300yards is point of impact so I use number in column marked "FD" and it tells me 21.1yards,So I take that 21.1 x 1.56= 32.916.What Now?? What if I need to sight it in for 200yards??the bullet will rise 4.7inchs according to the chart,how do I factor that in??

 

[redleg]

I guess this would be a good place to ask a question about this.I have a lazer bore sighter,the bullet type.I will use this example to explain what I allready know.I have a 300 Win Mag 180gr bullet and I want to sight it in for 300yards so I look at the chart on the back of the target and it tells me that 300yards is point of impact so I use number in column marked "FD" and it tells me 21.1yards,So I take that 21.1 x 1.56= 32.916.What Now?? What if I need to sight it in for 200yards??the bullet will rise 4.7inchs according to the chart,how do I factor that in??

That is not how the bore sighters are used. The boresighter is designed to point out where your bore is pointing so that you can get your sights/scope roughly aligned. Since the bullet trajectory, muzzle jump, and barrel harmonics are going to affect bullet POI, the laser can not compensate for them.
Set your gun on a rest, use a target out at 50m or so. Coindex the bore and sights/scope. Then shoot the rifle at 100m or so and fine tune your zero. If your ballistics chart says you should be 2" high at 100m for a 300m zero, your group should be that much higher than your POA.