sighting in. how high at 100 yards?

[JackOfAllTrades]

Bob... I'll disagree with you.  The bullet does not rise. (in relationship to the barrel)    Not at all.

-Steve

[bobcat]

It rises in relation to the line of sight. I guess you probably know that.

[Bob33]

Bob... I'll disagree with you.  The bullet does not rise. (in relationship to the barrel)    Not at all.

-Steve

I'm not sure what you're getting at Steve.  The bullet starts below the line of sight and ends up 2" or 3" high at 100 yards, depending on the how the gun is sighted in.

[Bofire]

 :)the bullet is falling from the instant it leaves the muzzle. the only reason it "arcs" is cause your barrel is pointed "up", to cross the line of sight.
duh
Carl

[sakoshooter]

Bob explained my sighting in method very well.
By sighting in dead on at 200 yds, you will be 7 1/2" low at 300. This is based on the info I already posted. That's definitely enough to miss most animals chest areas if you held dead center.
With the 3" high at 100 yd sight in method, the average high powered rifle shooting an average velocity will be within a 6" vital zone out to 300 yds without thinking about it. Any farther than that and you've really got to know yourself, your gun, the wind etc and the trajectory. Lots of variables that play a big part on an ethical shot past 300 yds. With the Maximum Point Blank Range method or 3" high at a hundred, one big variable has been removed from most shots.
As Bob stated, you can easily 'spine shot' your buck at 100yds +/- but that's why I aim for the heart when they're close - 0 - 150yds. You usually end up hitting the top of the heart and lungs.
Sighting in dead on at 100 or 200 yds is fine in the timber but spot one good buck across that draw on the next ridge and you'll be kicking yourself.

[bobcat]

Sighting in dead on at 100 or 200 yds is fine in the timber but spot one good buck across that draw on the next ridge and you'll be kicking yourself.

Not really, you just need to know your rifles trajectory, and hold a little high to compensate for the longer shots. I'd rather have to hold high at 300 yards than hold low at 200 yards. Generally with the longer shots you will have more time to think about it. If I sight my 270 in 3 inches high at 100, it's over 4 inches high at 200. The 3 inches high at 100 yards rule of thumb became popular before laser rangefinders were available, and it kind of made more sense then. Now, with a rangefinder, on the longer shots you don't have to guess at the distance so it's fairly easy to compensate.

[JackOfAllTrades]

:)the bullet is falling from the instant it leaves the muzzle. the only reason it "arcs" is cause your barrel is pointed "up", to cross the line of sight.
duh
Carl

 

I made a comment earlier just to note to the new people so there is not confusion.  That's all.

-Steve

[JimmyHoffa]

And the higher above your barrel that your sights/scope is, the greater the angle for that rise.  Can make for an interesting trajectory.

[bobcat]

:)the bullet is falling from the instant it leaves the muzzle. the only reason it "arcs" is cause your barrel is pointed "up", to cross the line of sight.
duh
Carl

 

I made a comment earlier just to note to the new people so there is not confusion.  That's all.

-Steve

Do people actually believe that a bullet rises when it leaves the barrel?  That would defy the laws of gravity!   

[Bob33]

Where's the "thread jacked" smiley?

The OP asked about sighting in a rifle, not a discourse on external ballistics.

If one wants to get pedantic about it, a bullet can indeed rise.  Point your barrel straight up, pull the trigger, and try to convince that it is dropping.

Gravity works on the bullet the second it leaves the barrel, but its absolute rise or fall, relative to the earth, is a factor primarily of the angle of departure. 

Let's hope that the OP understands we are talking about the bullet's path relative to the sight plane.

[JackOfAllTrades]

   Reading here, I think the OP has enough information on how to sight in his rifle. A discussion will often start with one subject and evolve into something else once the original subject fizzles.

Do people actually believe that a bullet rises when it leaves the barrel?  That would defy the laws of gravity!   

I spent years on the Firing Line and The High Road discussion forums.  Yes, some people do feel the bullet rises out of the muzzle.

Christ! Forget I made the comment.

-Steve

[bobcat]

Christ! Forget I made the comment.

 

[Gutpile]

:)the bullet is falling from the instant it leaves the muzzle. the only reason it "arcs" is cause your barrel is pointed "up", to cross the line of sight.
duh
Carl

 

I made a comment earlier just to note to the new people so there is not confusion.  That's all.

-Steve

Do people actually believe that a bullet rises when it leaves the barrel?  That would defy the laws of gravity!   :o

Yes, they do. I hear it all the time.

[high country]

Wow, can sure tell we are ready to do some shooting!
I can't believe the fact that there are 2 ways to attack this, correction or compensation. You guys are all compensating, try telling him how to correct now....lol.

[BallisticsNut]

In theory, the harmonics of a barrel could cause the bullet to rise, ever so slightly from the point of the barrel position.  So, to say that a bullet never rises once it leaves the barrel it not entirely correct.  You could determine that the "barrel whip" could actually cause the bullet to rise above the plane of the barrel once shot if the cartridge is not tuned for that particular rifle.  This is why we tune each cartridge for each particular rifle.  I have seen many references to this topic, such as "barrel whip" the "sine wave affect" and barrel "harmonics".  Essentially, each talking about the same thing.  Personally, I have seen the affects of this barrel whip in action.  I would see as much as 4-6" variance in shot placements, shooting from a stationary barrel position at a distance of 200 yards.  Testing the harmonics of a particular rifle and adjusting or reducing  the "barrel whip" so that the bullet leaves the barrel at the optimum time to produce the most accurate shots.  Thus, the term ladder testing.