Point blank zero calculator

[some_kid6]

I've been using this for my guns that don't have optic graduations or are for closer ranges. Might be useful for getting a practical zero distance for those red dots. Free/donateware as well! Wasn't sure if this should go under the "optics" subforum or not since iron sights could use this as well potentially.

HuntingNut

Home of PointBlank Ballistics Software

www.huntingnut.com

Here's an example I used for some of my SBRs to get a zero that keeps me within 2" of my point of aim (4" circle) out to 230 yds.

 

[Tim]

This approach - point blank range zero - is awesome for RDS equipped rifles

 

[JBoyette]

This approach - point blank range zero - is awesome for RDS equipped rifles

100%.

If one connects the MOA dot size to range distance to PBR-Zero. "One can keep them in the dot" it's crazy scary how well that mix works

 

[AR10ShooterinNC]

This is what we did back in the late 80's and 90's, before the tactical scopes took over.

 

[GymB]

Is this a technical approach to “zero your rifle at 25 yards and you’ll be good to 250”?

 

[Tim]

Is this a technical approach to “zero your rifle at 25 yards and you’ll be good to 250”?

pretty much

Change '25 yards' for whatever distance gives you the max distance within your desired +/- POA/POI. For example, my 300BLK zero'd at 34 yards gives me no more than 3" +/- POA out to 236 yards. I chose to input the 3" tolerance, the computer kicked out the optimum zero distance for that.

 

[Windini]

I chose to input the 3" tolerance, the computer kicked out the optimum zero distance for that.

Did you use Strelok for that, or another calculator?

 

[JBoyette]

Is this a technical approach to “zero your rifle at 25 yards and you’ll be good to 250”?

Nope not even the same ball game, but played in the same ball park, think kick ball vs baseball. LOL

A PBZ is taking a object size IE (8") circle as the Constant.

Goal is to keep the trajectory within that objects size to X distance.

Not intersect the trajectory at X distance and learning the short distance correlation.

 

[Tim]

Did you use Strelok for that, or another calculator?

Pretty much. I actually used Kestrel and Applied Ballistics, but essentially the same thing. Plugged in all of the data for my load (bullet weight, twist, muzzle velocity, etc.), plugged in my desired +/- range (what @JBoyette refers to above as the 8" circle constant, mine is a 6" circle or +/-3")

Strelok would give you the same info. Then verify at the range of course.

re: @JBoyette 's comment above responding to @JimB ....

In my 300BLK example, my 'near' zero is 34 yards, and the 'far' zero is around 205yards. Those are the 2 points where POA=POI. I'll actually be within my desired 3"+/- (6" circle) out to ~240 yards.

 

[JBoyette]

Pretty much. I actually used Kestrel and Applied Ballistics, but essentially the same thing. Plugged in all of the data for my load (bullet weight, twist, muzzle velocity, etc.), plugged in my desired +/- range (what @JBoyette refers to above as the 8" circle constant, mine is a 6" circle or +/-3")

Strelok would give you the same info. Then verify at the range of course.

re: @JBoyette 's comment above responding to @JimB ....

In my 300BLK example, my 'near' zero is 34 yards, and the 'far' zero is around 205yards. Those are the 2 points where POA=POI. I'll actually be within my desired 3"+/- (6" circle) out to ~240 yards.

It happens alot like that.

 

[REELDOC]

You can do the same thing with JBM. Look at' zero max point blank' and 'include danger space'.

JBM - Calculations - Trajectory

www.jbmballistics.com

 

[Tim]

Did you use Strelok for that, or another calculator?

This is what you look for in StrelokPro

 

[GymB]

Nope not even the same ball game, but played in the same ball park, think kick ball vs baseball. LOL

A PBZ is taking a object size IE (8") circle as the Constant.

Goal is to keep the trajectory within that objects size to X distance.

Not intersect the trajectory at X distance and learning the short distance correlation.

Got it, thanks

 

[JBoyette]

This is what we did back in the late 80's and 90's, before the tactical scopes took over.

I think what happened is, it's easy to always have come-ups. Meaning

0 to 100yds = + hold
100yd zero = 0 +/-
100yds to 10,000yds = + hold