Help with holdover/under calculation

[ACC]

I am headed out on Friday to our property to deer hunt for the weekend. Got my deer rifle all sighted in and ready to go two weekends ago.

But now, my wife asked me to take her friend's husband with us. He has deer hunted before, but does not have a deer rifle. So I am setting him up with the only other deer caliber rifle I have in the armory. Suppressed 300BLK AR with 9" barrel.

Problem is, I have not had a chance to sight it in at 100 yards (my normal zero). So I have to go to an indoor range this evening to try and work out a zero at 25 yards (max bay depth).

So....my question is, if I get it all sighted in at 25 yards using 150 grain Winchester Deer Season XP (1900 FPS at muzzle), what should my approximate hold over/under be at 100 yards?

 

[rosejm]

Knowing the distance between your scope & barrel (bore offset) is the missing quantity here.
Usually that's between 1" and 3" - AR pattern rifles are often 2.5"

How confident are you in that muzzle velocity out of a 9" barrel?

There can be lots of other details for much further distances, but @ 100y that bore offset & muzzle velocity will be the biggest factors w/ a 25y zero.

for a 25y zero, 1900fps

bore offset	approx Point of Impact from Point of Aim
1"	-1"
1.5"	+0.5"
2.0"	+2.0"
2.5"	+3.5"
3"	+5.0"

You can get approximations with much more detail if you have info like the bullet's BC (some manufacturers provide, some are super secretive)

ShootersCalculator.com | Ballistic Trajectory Calculator

Calculates the ballistic trajectory of a bullet fired from a rifle, handgun or other firearm. Produces a ballistic trajectory chart and table that shows the drop, velocity, kinetic energy, windage, and trajectory of a bullet.

shooterscalculator.com

Zero @ 25y, then dial in the number of inches (probably DOWN) for the appropriate offset.
Now you're well within minute-of-deer, point & shoot.

 

[Levergun1]

Zero at 25 yards. At 100 yards, you'll still be minute of deer.
No need to over think this.

 

[MCgrease08]

Murphy's Law would suggest you don't zero it at all. If you spend lots of time preparing and getting dialed in you won't see any deer. If you go into the woods completely unprepared you'll see a parade of them.

Apply purple as needed.

 

[usmcdjb]

Little late to the thread, but a rifle used to deer hunt in Indiana has to have a 16 barrel (minimum) I do believe.

 

[M.Cain]

Little late to the thread, but a rifle used to deer hunt in Indiana has to have a 16 barrel (minimum) I do belleave.

It can be a pistol in a legal caliber and you have a license to carry .And the friend still needs a resident deer firearm license. I hunt with a moa pistol 14" barrel in 308 and my 2" screw on brake does not count as overall length ether .