True Range Zero

[Vandy321]

Not sure I completely understand the true range zero that Frank was talking about in Ep 197.

I see Hornady 4DOF allows me to input how high the POI is at a given range, (say .07 mil @98.5 yards, just a random example)

I forget rye example he used it it was something like 9mm high at 100 yard zero gave a true range zero of 145...so now you'd input your zero range as 145?

Is there an easy way to calculate that true range in order to input that into AB, since AB doesnt have that correction factor?

Hope I'm not butchering that too much, will edit if I'm saying things wrong, to avoid confusion.

 

[Deleted member 113831]

AB allows you to input zero offset. Same thing.

 

[_Windrider_]

^^^^yep.

 

[Vandy321]

Rog, thanks fellas, my mistake...found it now in the manual.

 

[FishDr]

Shooter app also has zero offset as well. Handy for a switch barrel rig!

 

[seansmd]

@lowlight isn't this the same as entering zero offset in the kestrel, so if my best adjustment is off by +0.05mil at my given zero range, I just enter 0.05mil in the kestrel offset?

 

[_Windrider_]

@lowlight isn't this the same as entering zero offset in the kestrel, so if my best adjustment is off by +0.05mil at my given zero range, I just enter 0.05mil in the kestrel offset?

Yes.

 

[Lowlight]

it accomplishes the same thing, but it is not discussed in the same way.

These others specifically talk about a True Range Zero vs a Zero Offset which is more in line with changes to the system without actually re-zeroing.

The offset is often discussed when switching ammo, adding a suppressor, not being perfectly zeroed due to an outside factor. A true range zero in these other apps actually calculates a new distance and helps visualize the difference,

It's more a perception thing, what you are looking to accomplish

 

[seansmd]

Ok so if I understand correctly, if my zero group is high by 0.05mil and I either enter the offset or calculate the true range zero and use either in my ballistic calculator my dope should be the same level of accurate at distance?

The true range zero shows that the zero is beyond 100y at some distance vs an offer that doesn't really describe where the zero is.

 

[Dthomas3523]

Ok so if I understand correctly, if my zero group is high by 0.05mil and I either enter the offset or calculate the true range zero and use either in my ballistic calculator my dope should be the same level of accurate at distance?

The true range zero shows that the zero is beyond 100y at some distance vs an offer that doesn't really describe where the zero is.

Yep. One way is saying “I have a 100yd zero but it’s .1” high” and the other is saying “I have a 107 yd zero”

Tomato Tomato

 

[Eurodriver]

Yep. One way is saying “I have a 100yd zero but it’s .1” high” and the other is saying “I have a 107 yd zero”

Tomato Tomato

This is super helpful, and may be the reason for my post earlier. Thank you!

 

[Lowlight]

.1 Mil off center, is 45 yards according to the True Range Zero features. I have seen it rounded to 50, but a 1/10th +/- is about 45 yards.