100 yd zero hitting high at 200 yd

[Nunu]

Of course, as we've been trying to explain to him all afternoon, you will always be lower than your zero point at every distance past it. Maybe he understands that now, but I doubt he will admit it. I don't want to beat him up for it, I just hope he learned something here. I'm not even mad at him for his posts about how I didn't know what I was talking about. He was just wrong, and we've all been there, I know I have.

Not always. Try to zero at 25 yards and your POI will go higher past your zero. Mine meet my line of sight again somewhere around 150 yards.

 

[Straight Shooter]

^^^^^ Is this using a scope or iron sights?

 

[Deleted member 115360]

Not always. Try to zero at 25 yards and your POI will go higher past your zero. Mine meet my line of sight again somewhere around 150 yards.

You are correct. That is because of the difference in height between your scope and your barrel. There have been calculators built for this. I should have probably noted that anomaly. It only applies at very short ranges. Conversely, with your 100y zero, there will be a point at 25-40y "depending on scope height, scope diameter, cartridge etc) where you will be crossing the plane at the same height as you will at 100y, or whatever distance you choose for your zero.

 

[baggy270]

Why do threads always devolve into sarcasm and personal attacks?

 

[LVJ76]

Why do threads always devolve into sarcasm and personal attacks?

Starting to sound like liberals

 

[GDKinCO]

I dip my bullets in Red Bull, and we all know "Red Bull gives you WINGS!" So, can my bullets climb?

 

[memtb]

Without reading all of this, and please forgive me if it has been covered!

Obviously bullets cannot rise above the bore assuming the bore is parallel to terra firma. Is it possible, that the scope could adjusted so as the first time the bullet crosses "line of sight", due to bore angle in relation to the line of sight, at 100 yards in stead of the generally assumed 20 to 30 yards. In other words, is it possible using, say a 20, 40 or something mil- base ( or scope mouted very high above the bore) move the bullets first intersect with line of sight much farther downrange? Thereby, causing the bullet to be high at 200 yards!

This is above my pay grade to compute.....merely thinking "outside the box"! memtb

 

[1mechanic]

JBM ballistics in their FAQ down on the bottom explains it better than I can but basically when you adjust the scope for zero you take the moa of the base out of the equation. The scope mount above the bore has an effect but it would have to be an awful high mount to get the problem the OP is having.

 

[1mechanic]

Just did some calculations and with the OP's bullet, FPS and sight in at 100 yards the scope would have to be mounted 6" high of the bore for it to be 2" high at 200 yards.

 

[memtb]

JBM ballistics in their FAQ down on the bottom explains it better than I can but basically when you adjust the scope for zero you take the moa of the base out of the equation. The scope mount above the bore has an effect but it would have to be an awful high mount to get the problem the OP is having.

After my post, I remembered the "see through rings" that were popular with some, back in the 60's or '70's. They would put the scope quite high above the bore!

I'm certainly "not" trying to get in this "dog fight"......merely trying to learn what if anything could cause this anomaly! memtb

 

[capona]

Time to drop the hammer and the penny from the tower to see what falls faster.

I'm kind of surprised at this thread on a long range forum discussion. But sometimes we can get bogged down in the semantics of the word climb.

Look at a ballistics chart and the path.
Know that barrel and scope are not based on a parallel line of sight like 2 lasers, when at distances.
If you are zero at 100, and high 2" at 200. You did something wrong or you have a mechanical or optical issue going. Simple as that. Re-Verify your zero at 100, then check scope calibration.

 

[1mechanic]

Are aerodynamics involved or just gravity? lol

 

[Rich Coyle]

You're confusing the issue again. This doesn't make a 100y zero hit high at 200y. With a
Listen, there is no climbing. Your barrel is pointed up at an angle, and the bullet is falling from that line constantly. Attempts to explain this as a "rise" or "upward trajectory" just aren't accurate. I fully understand the point you are trying to make, and your rifle is canted skyward when your scope is parallel to the earth, but the bullet doesn't rise or climb or anything else. Bullets are immediately effected by gravity, and gravity pushes objects towards the earth, and it is that simple. The reason I want to be so clear about this is because many people look at a trajectory diagram and believe that bullets leave the barrel and climb skyward, which isn't the case.

You are the one confusing the issue. The bullet climbs in relation to level ground. You can say all the words physicist like to use, but it does not change the fact the bullet goes up in relation to level ground.

 

[Rich Coyle]

I'm trying to think of how I can break this down in a way that everyone can understand it.

Imagine a rifle in a vice. No scope. It is locked in a vice that allows it to hit the center of your target perfectly at 100y. It crosses that height once at somewhere near 31 yards and then again at the 100y mark. There is a point at about 70ish yards where the bullet hits max ord, the highest point of its flight, and then falls until it intersects with your target at 100y. Once it hits that highest point at 70ish yards, it will never again be that high. It will fall from there on a predictable trajectory until it makes contact with an object.


That's it boys, there is no magic. There is no climbing. I cannot make it any simpler

You are verifying what others are saying. The bullet went up in relation to the ground and then fell into the 100 yard zero.