Technical question on trajectory!

[Jerome Lowery]

We are shooting a .300 RUM

Zero at 200 yards.

According to various ballistic calculators.

At 500 yards it calculates a bullet drop of 32.4 inches.

A custom elevation turret was ordered to all the correct specifications to a very reputable company.

Gave ALL applicable data, velocity, bullet weight, BC, etc.

Set 2 targets at 200 yards. The top one was exactly 32.4 inches above it.

Turned the turret to 500 yards, fired at the bottom target.

I was assuming the bullet would hit the top target, right on.

Not on the paper and no idea where it's hitting.

Am I making the wrong assumption, or is there a problem with the turret, or even the ballistic calculator data?

Any and all responses would be appreciated.

Thank you!

 

[dirtytough]

You should only be 12"-13" high @200 yards with your turret set for 500 yards.

You need to run the numbers on a calculator.

 

[Jerome Lowery]

Thank you.
Where did you get the info?
Just curious!

 

[MattB355]

You should be a lot closer as stated by the dirtytough. Make sure you account for your barrel center vs scope center height as well as actual measured velocity at the muzzle and not what is on the ammo box or reloading book. As long as your data is spot on the math works very close to real world. Also, make sure you know your elevation as air density is a major variable.

 

[dirtytough]

Thank you.
Where did you get the info?
Just curious!

I just looked quick at my data with Bergers calculator. I don’t zero @200 so I had to change a few little things.

 

[Flatgo]

Here is a math response. 32" is approximately 6.5 MOA at 500 (1 moa = 5" at 500 yards). 6.5 Moa is approximately 13" at 200 (1 moa = 2" at 200 yards). you have to think in angles and not inches of drop.

 

[Rob5589]

Quick glance, you're off. No way that bullet is dropping 32" from 2-500 yards.

Try this,

JBM - Calculations

www.jbmballistics.com

 

[Lawnboi]

This is exactly why it’s easier to learn a moa/mil based system when measuring drops and not going by inches. At 500 yards it’s unlikely variables are going to take you that far off, but I prefer to be as precise as possible especially at that range and farther.

32“ at 500 yards is 13 something inches just with rough numbers in my head when converting to angular measurement which makes this whole thing way simpler.

-Other things to consider. Are you using factory ammo? Different lots can have very different velocities
-did you confirm drops prior to having it
-Did you chronograph this load? At what weather variables?
-Have you checked your scope tracking
-How much do you trust your 200yd zero? Was it done in ideal conditions?

Not trying to sound like a jackass at all, but this is exactly why pressing the easy button and having a turret cut is the completely ass backwards way of learning your rifle.

 

[KurtR]

zero it at 200 throw the custom turret in the garbage use the turret it came with. Run it through a calculator shoot your drops to verify. Make a card to be on the gun. Then practice because vertical is easy its the horizontal (wind) that will make you miss

 

[wind gypsy]

Exhibit 12,539 of why I hate "custom turrets".

If you want to verify your 500 yard dope, shoot at 500 yards.