Beginner scope question.

[TrxR]

I am going to be going to my first F/TR match/training day on the weekend and wanted to ask a quick question. If my scope has 1/8moa clicks it would move about .131" at 100yds correct? If that is right at 200 it would be double that which is .262? So therefore at 800 yards it would be 1.048" ?

Do I have the idea or am I off?

Thanks

 

[BoydAllen]

No, you are not off. (When I calculated it, It came out to 1.047, but I seriously doubt that anything in the system would resolve to the third place, so it is probably meaningless)

 

[mysticplayer]

Sorry, if this gives you a headache but when adjusting your scope, remember that you are not moving a point in space but a GROUP. Now if you and your rifle are shooting in the 1's at distance, disregard the following

Most newbies run into this problem and typically get frustrated with the over/under correction and then start blaming gear and scopes.

Easiest way to show this is take a paper target (8.5x11"). Put a quarter anywhere on that target. Put a dot on that quarter anywhere. Now "move" that dot into the center of the target.

You will see that part of the quarter isn't sitting over the center of the target if the dot is also not dead center on the quarter.

If you and your rifle are shooting 1/2 MOA on average, you are moving a theoretical 4" diameter circle at 800yds around that target NOT a bullet hole. The shot that is indicated can be anywhere inside your group. Add in the possible distortion of your group due to wind reading errors, and you may have a group that looks more like an Eggplant and BIGGER then the mechanical performance of the rifle.

That 9 you want to adjust for may very well be at the far end of a well centered group.

Now the tricky part, how much to move to center the group? That will come with experience as you learn your gear and your shooting. The simplest answer is LESS then what it would take if the spotter was perfectly centered in your group.

Most will consider 1/2 to 3/4 of the "full" amount, then quickly tweak based on follow up shots.

At some point, you will center your group ... hopefully.... and the shots will land in and around the 10/X ring if the windage call is correct.

So don't be surprised if 2 clicks sends the next shot 1 scoring ring too far. If you move a disc over a target, this will become a lot easier to understand.

Good luck.

Jerry

 

[Jourdan_D]

Sorry, if this gives you a headache but when adjusting your scope, remember that you are not moving a point in space but a GROUP. Now if you and your rifle are shooting in the 1's at distance, disregard the following

Most newbies run into this problem and typically get frustrated with the over/under correction and then start blaming gear and scopes.

Easiest way to show this is take a paper target (8.5x11"). Put a quarter anywhere on that target. Put a dot on that quarter anywhere. Now "move" that dot into the center of the target.

You will see that part of the quarter isn't sitting over the center of the target if the dot is also not dead center on the quarter.

If you and your rifle are shooting 1/2 MOA on average, you are moving a theoretical 4" diameter circle at 800yds around that target NOT a bullet hole. The shot that is indicated can be anywhere inside your group. Add in the possible distortion of your group due to wind reading errors, and you may have a group that looks more like an Eggplant and BIGGER then the mechanical performance of the rifle.

That 9 you want to adjust for may very well be at the far end of a well centered group.

Now the tricky part, how much to move to center the group? That will come with experience as you learn your gear and your shooting. The simplest answer is LESS then what it would take if the spotter was perfectly centered in your group.

Most will consider 1/2 to 3/4 of the "full" amount, then quickly tweak based on follow up shots.

At some point, you will center your group ... hopefully.... and the shots will land in and around the 10/X ring if the windage call is correct.

So don't be surprised if 2 clicks sends the next shot 1 scoring ring too far. If you move a disc over a target, this will become a lot easier to understand.

Good luck.

Jerry

^^^ explained so well even i could understand that

 

[Lapua40X]

TrxR, your math looks fine. Even though this may not apply to your circumstances, some new shooters seem to get so hung up on accuracy that they miss the practical realities of ballistics.
Considering that ballistics is affected, sometimes dramatically, by everything from barrel temperature to atmospheric pressure and wind, we could all drive ourselves insane trying to account for every variable out to the third decimal.
1/8 MOA, for practical purposes, is 1/8 or .125 inches. Using that constant, the 800 yard equivalent works out to 1 inch.
I'm confident that you're aware of all that but I just felt obligated to include it for the new shooters who might tune in to your post.The additional .048 inches isn't worth your time and will tend only to confuse the shooter when the pressure of competition raises its ugly head.

 

[TrxR]

Thanks everyone :

Jerry: That was very well explained and I understand what your talking about. I have seen this in short range to a small degree when shooting 100yds with the 40X rimfire off the bench.

Looking forward to trying it this weekend.

Thanks

 

[mysticplayer]

Sorry, if this gives you a headache but when adjusting your scope, remember that you are not moving a point in space but a GROUP. Now if you and your rifle are shooting in the 1's at distance, disregard the following

Most newbies run into this problem and typically get frustrated with the over/under correction and then start blaming gear and scopes.

Easiest way to show this is take a paper target (8.5x11"). Put a quarter anywhere on that target. Put a dot on that quarter anywhere. Now "move" that dot into the center of the target.

You will see that part of the quarter isn't sitting over the center of the target if the dot is also not dead center on the quarter.

If you and your rifle are shooting 1/2 MOA on average, you are moving a theoretical 4" diameter circle at 800yds around that target NOT a bullet hole. The shot that is indicated can be anywhere inside your group. Add in the possible distortion of your group due to wind reading errors, and you may have a group that looks more like an Eggplant and BIGGER then the mechanical performance of the rifle.

That 9 you want to adjust for may very well be at the far end of a well centered group.

Now the tricky part, how much to move to center the group? That will come with experience as you learn your gear and your shooting. The simplest answer is LESS then what it would take if the spotter was perfectly centered in your group.

Most will consider 1/2 to 3/4 of the "full" amount, then quickly tweak based on follow up shots.

At some point, you will center your group ... hopefully.... and the shots will land in and around the 10/X ring if the windage call is correct.

So don't be surprised if 2 clicks sends the next shot 1 scoring ring too far. If you move a disc over a target, this will become a lot easier to understand.

Good luck.

Jerry

^^^ explained so well even i could understand that

You'll hear experienced shooters comment "if I had just held center, I would have lost less points".

Somedays, we finesse our shots way too much and miss because of it.

Jerry