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Old 11-17-2006, 06:29 AM   #1
 
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Default another quick question about ballistics

last night I was only able to squeeze in a few shots at a 25 yard target. I had my scope taken off of my gun and then bore sighted it. I shot about 15 rounds at the 25 yd target with my 300 win mag using the 165 grain hornady's before I got a nice 4 shot group in the bulls eye.I ran out of daylight to get any kind of shots at the 100 yard target. My question is if I am hitting the bull at 25 where can I expect to be at say 50, 100 then 200? Any help is appreciated. I am no specialist when it comes to this stuff.
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Old 11-17-2006, 08:02 AM   #2
 
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Default RE: another quick question about ballistics

Its hard to say. It should be higher at each of those distances. The bullet will still be on the upward portion of the arc. Now keep in mind that even a slight out of alignment is magnified 4 fold at 100.
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Old 11-17-2006, 08:45 AM   #3
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Default RE: another quick question about ballistics

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Its hard to say. It should be higher at each of those distances. The bullet will still be on the upward portion of the arc.
Ok please dont get mad at me but part ofwhat you said was incorrect.

Bullets don't leave the barrel and then go upward. Gravity acts upon the bullet the instant it leaves the barrel. The reason it appears to hit high is because the point of impact is above your line of sight at 25 yards becuase your sights and/or scope sits above the line of the bore.

Your line of sight is actually at a very slight downward angle in relation to the barrel causing it to cross the bullets path at the zero range be it 100, 200 yards etc. The bullet isn't on an upward arc, it hasn't dropped to your line of sight yet.

So you can think of it more as we are "lobbing" the bullets at longer ranges. We just increase the angle so that they land at range. There is nothing short of rocket power that can cause a bullet to actually arc up after it leaves teh barrel.

I don't blame you it's not an easy concept to get your mind around. Heck, I had to explain it to my gunsmith. Maybe this will help:

http://www.chuckhawks.com/bullet_trajectory.htm


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Old 11-17-2006, 08:53 AM   #4
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Default RE: another quick question about ballistics

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ORIGINAL: salty

last night I was only able to squeeze in a few shots at a 25 yard target. I had my scope taken off of my gun and then bore sighted it. I shot about 15 rounds at the 25 yd target with my 300 win mag using the 165 grain hornady's before I got a nice 4 shot group in the bulls eye.I ran out of daylight to get any kind of shots at the 100 yard target. My question is if I am hitting the bull at 25 where can I expect to be at say 50, 100 then 200? Any help is appreciated. I am no specialist when it comes to this stuff.
A rough estimation using my software puts you still on at 50, probably ~2" high at 100, and close to 4" high at 200.
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Old 11-17-2006, 08:54 AM   #5
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Default RE: another quick question about ballistics

It is hard to tell. I have sighted in some rifles at 25 yards that were pretty close at 100 yards. On the other hand, some guns that were zeroed at 25 yards were up to nine inches high at 100.
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Old 11-17-2006, 09:18 AM   #6
 
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Default RE: another quick question about ballistics

thanks guys...
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Old 11-17-2006, 09:22 AM   #7
 
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Default RE: another quick question about ballistics

Like BA, I put used some very generic numbers for 300wm in a nifty little computer program. Try sighting in about 3/4" or 1" low at 25 yards. That should keep you on paper out to 200. With a zero at 25 yards you gonna be high at 200
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Old 11-17-2006, 11:13 AM   #8
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Default RE: another quick question about ballistics

ok, measure the distance center to center of your scope and barrel, this gives you your scope heigth, since you are raising your bullet that much at 25 yds, it will be that much high at 50, and 4 times that high at 100.
Oh and brutal, we know a bullet doesn't arc, unless you have the rifle barrel at an angle which it always is, thats what a scope does. clamp your rifle in a vise and turn the up knob, watch the crosshairs move down in the field of view, now youv'e moved the crosshairs downso you raise the rifle, therefore angleing the barrel so the bullet path is higher.
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Old 11-17-2006, 11:28 AM   #9
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Default RE: another quick question about ballistics

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Oh and brutal, we know a bullet doesn't arc, unless you have the rifle barrel at an angle which it always is, thats what a scope does. clamp your rifle in a vise and turn the up knob, watch the crosshairs move down in the field of view, now youv'e moved the crosshairs downso you raise the rifle, therefore angleing the barrel so the bullet path is higher.
So you agree. Good!
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Old 11-17-2006, 01:12 PM   #10
 
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Default RE: another quick question about ballistics

But to somebody who's never given it any thought it can be quite mind bending. I spent nearly half an hour trying to explain to my buddy that the disadvantage of using see-thru rings is that the scope is mounted higher which then increase the angle between crosshairs and bullet path...leading to more hold over. Drew pictures and everything! LOL

BTW, I don't think they're really is that much difference unless you got a long range setup. For practical woods use I would like them if they didn't introduce the other problem about getting a good cheek-weld. (for me at least)
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