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# Line of Sight and Trajectory

#1
11-16-2011, 01:50 AM
 Bronze Member Join Date: Jan 2011 Location: Philadelphia, PA. Posts: 53
Line of Sight and Trajectory

Hello all, I have a question about line of sight as it relates to trajectory. If a round drops 30" at 400 yards, wouldn't the center of the target have to be at least 30" above the line of sight? I understand that the drop from the axis of the bore will be more because the barrel is angled slightly upward. It is my understanding that the line of sight is a straight line from the sight to the target. I guess what I am asking is - how can one shoot at a distance if the target is not sufficiently high? On a completely flat surface, wouldn't one be limited in distance by the drop from line of sight at a specific distance? Please help, this is driving me crazy.
#2
11-16-2011, 06:07 AM
 Gold Member Join Date: Apr 2009 Location: Carrollton, Ohio Posts: 637
Re: Line of Sight and Trajectory

Quote:
 wouldn't the center of the target have to be at least 30" above the line of sight?
[deleted wrong statement]

I should have stopped reading your gibberish, it screwed me all up.

The target is exactly the same height as the line of sight.

The bore axis is the only thing aligned above the line of sight.

Quote:
 how can one shoot at a distance if the target is not sufficiently high? On a completely flat surface, wouldn't one be limited in distance by the drop from line of sight at a specific distance?
That is the part that is backwards; unless there is a ceiling above that surface, there is no problems whatsoever.

Last edited by justgoto; 11-16-2011 at 06:31 AM. Reason: i'm an idiot
#3
11-16-2011, 12:00 PM
 Bronze Member Join Date: Jan 2011 Location: Philadelphia, PA. Posts: 53
Re: Line of Sight and Trajectory

Thank you for your reply. I don't understand where drop is measured from. The gibberish comment is uncalled for.

Tim

Last edited by phillietimothy; 11-16-2011 at 01:07 PM. Reason: I respect this forum and it's members. I choose to not be cast in a bad light.
#4
11-16-2011, 12:16 PM
 Platinum Member Join Date: Mar 2008 Location: SW Idaho Posts: 1,315
Re: Line of Sight and Trajectory

Having a bit of trouble understanding what you are asking. Maybe this will help.

#5
11-16-2011, 12:45 PM
 Bronze Member Join Date: Jan 2011 Location: Philadelphia, PA. Posts: 53
Re: Line of Sight and Trajectory

Scot E,

That helps immensely. I was having a lot of difficulty phrasing the question. When I see 30" drop at 400 yards, according to the diagram, the drop is from the trajectory line. Is this correct, thanks again.

Tim
#6
11-16-2011, 12:55 PM
 Platinum Member Join Date: Jan 2011 Location: Northern Utah Posts: 1,153
Re: Line of Sight and Trajectory

What that drop means is that if your gun was sighted in for 100 yards and you shoot at your 400 yard target you would miss low by 30". The diagram that Scott posted shows you that you can compensate for this drop by adjusting your scope so that your bullet will hit where your line of sight is pointing at a given range.

Another way you could look at it: hold 30" above where you want to hit at 400 yards and the bullet will follow the trajectory as shown in his diagram and still hit where you wanted it to hit even though according to your line of sight you were aiming 30" high.

All this trajectory talk could be negated if we shot projectiles that weren't affected by gravity. Ex. Laser gun.
#7
11-16-2011, 01:04 PM
 Bronze Member Join Date: Jan 2011 Location: Philadelphia, PA. Posts: 53
Re: Line of Sight and Trajectory

Browninglover1,

Tim

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