Trajectory and POI, Confused.
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Trajectory and POI, Confused.


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Old 11-16-2013, 06:40 PM   #1
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Default Trajectory and POI, Confused.

I would like to know if on a .300 win mag sighted dead on at 100 yards with a yard marking scope if I still need to compensate for the drop of about 3 1/2 - 4 inches with a 300 yard target?

Not my gun, my brothers, he seems pretty convinced that I don't need to adjust for any drop when firing his gun past the dead on mark. Im confused.


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Old 11-16-2013, 06:52 PM   #2
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According to the attached graph drop is about 10 inches at 300 yards, that is significant. I prefer to sight my deer rifles about two inches high at 100 yards.

http://gundata.org/cartridge/63/.300-winchester-magnum/


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Old 11-16-2013, 06:54 PM   #3
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If the scope is zeroed at 100 yards, it will impact about nine inches low at 300 yards.
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Old 11-16-2013, 06:58 PM   #4
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Quote:
Originally Posted by Layla View Post
I would like to know if on a .300 win mag sighted dead on at 100 yards with a yard marking scope if I still need to compensate for the drop of about 3 1/2 - 4 inches with a 300 yard target?

Not my gun, my brothers, he seems pretty convinced that I don't need to adjust for any drop when firing his gun past the dead on mark. Im confused.
Get the ammo make and the weight of the bullet and go to the MFG's website, there is almost always a graph that shows the long and short trajectory. If this turns into a pain, post the make and bullet weight here and I'll see if I can't get it and post it on this thread.
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Old 11-16-2013, 07:41 PM   #5
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Where's y'all's manners?

Welcome to the forum Layla! Hope you enjoy your time here and stick around if you'd like.

And yes, these guys are correct, you do have to compensate for bullet drop past the zeroed range.

A website you can check out is hornady's. They have a chart on there for different weights and velocities. It may not apply EXACTLY the same with all other maker's ammo, but it'll come out so close that it probably doesn't matter. I'll see if I can find I link for ya, but the 9-10 inches already mentioned is pretty accurate.

I think there's also smart phone apps for that.
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Old 11-16-2013, 07:44 PM   #6
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Here's a calculator. Looks like it's pretty detailed.

http://m.hornady.com/ballistics-resource/ballistics-calculator
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Old 11-16-2013, 07:45 PM   #7
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And here's their downloadable chart.

http://m.hornady.com/ballistics-resource/ballistic-chart

Have fun!
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Old 11-16-2013, 10:13 PM   #8
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Hi Layla! As the folks have said-ALL bullets begin to drop when they leave the muzzle. The line of the bore is above the point of impact- when you shoot, you shoot UP- and the bullet drops back down to your target. Further away, bullet has continued to fall. If you do not allow for that, you will miss.

This is just a sample- firearm here is zeroed for a 200 yard target. Bullet rises above line of sight, and drops back to hit at 200. But if zero is not changed, or shooter does not compensate for longer range, bullet will hit lower and lower as you move further out. Just like using a garden hose- to get something wet further away, you point higher.

trajectory.png
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Old 11-16-2013, 10:56 PM   #9
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With Bullet weights from 130 to 200 and MV from 3500 to 2700 (and this was just Federal) I'm thinking the devil will be in the details.
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Old 11-16-2013, 11:31 PM   #10
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It is possible to have a 150-200 yard zero and forget about it.
Not that this scores 10's, but it's a shoulder/heart shot for 0 to 300 yards.
.300 WinMag is fairly flat shooting.


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