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243 Winchester, Hunting & Ballistics:
Centerfire Rifle Ballistics
Written by: Kim Lockhart, Copyright.

External Ballistics:
 External ballistics pertains to bullet velocity, energy and trajectory down-range. Bullet trajectory is the flight path of the bullet relative to some known and fixed points.

Bullet Trajectory And Sighting Plane:
 1. Point blank range when sighting in a rifle is the first point at which the line of sight intersects with the bullets path in the bullets trajectory.
 2. Mid-range rise when sighting in a rifle is the highest point in the bullets trajectory between the point blank range and true zero.
 3. True zero when sighting in a rifle is the second point at which the line of sight intersects with the bullets path in the bullets trajectory.
 4. Maximum point blank range when sighting in a rifle is the height of the mid-range rise and the bullet drop beyond true zero, both are equal in measure.

correct-trajectory-sight-plane
correct-trajectory-sight-plane-scope-view

Rifle Sight Height And Bullet Trajectory:
 To properly sight-in a hunting rifle a person needs to know a little bit about their scope mount height of their rifle as this affects the sight plane that intersects with the bullet's trajectory.
Rifle Sight Height to Bore Center Line:
Open Sights = 1 inch sight height.
Rifle Scope Center Line to Bore Center Line:
Standard 1 Inch Diameter Scope Tube.
Low Scope Mount And Rings = 1.5 inch sight height.
Medium Scope Mount And Rings = 1.8 inch sight height.
High Scope Mount And Rings = 2.0 inch sight height.

Rifle Barrel Length, Bullet Velocity And Energy:
 Bullet velocity readings are generally taken from a rifle barrel length of 24 inches and using the following formula the bullets energy is determined; velocity x velocity x bullet weight = _ divided by 450,340 = bullet kinetic energy in foot pounds. If your rifle barrel length is not 24 inches then you have to recalculate the bullet velocity and bullet energy, bullet velocity deviation by barrel length;
Rifle Barrel Length Shorter Than 24 Inch You Subtract Velocity.
Rifle Barrel Length Longer Than 24 Inch You Add Velocity.
2,500 to 3,000 feet per second advertised velocity, adjust at 20 feet per second per inch from standard of 24 inch rifle barrel.
3,000 to 3,500 feet per second advertised velocity, adjust at 30 feet per second per inch from standard of 24 inch rifle barrel.
3,500 to 4,000 feet per second advertised velocity, adjust at 40 feet per second per inch from standard of 24 inch rifle barrel.

Bullet Ballistic Coefficient:
 The bullet ballistic coefficient, higher B.C.s mean flatter trajectories and higher retained energy down-range on target. A ballistic coefficient is the measure of a bullet's relative ability to overcome air resistance. Each bullet is assigned a numerical value expressing this efficiency. Ballistic coefficient calculations combine both shape and sectional density factors.

Bullet Energy:
 Before the bullet is down-range and on target, you have to know whether the bullet will have enough energy retention to cleanly harvest the animal. A bullet's kinetic energy is measured in foot pounds, and this is a proxy for what's generally termed stopping-power. The higher a bullet's energy at the point of impact, the greater its stopping-power.

Target Size And Bullet Energy Needs:
 Just as important is the size of target that a game animal that your hunting presents to you, typically standing broadside, exposing heart and lung area. Below are several hunting ballistics and sight-in charts for 243 Winchester ammunition that categorize this ammunition to its practical use on various game animals for hunting at various distances.


243 Winchester And Deer Size Game Hunting:
Deer Size Animals Include: Antelope, Blacktail Deer, Hogs, Javelina, Mule Deer And Whitetail Deer. These animals can be somewhat small at times and offer about an four inch target zone, for a correct rifle sight-in, a two inch mid-range is required for minimum bullet trajectory effect.
For this size animal, I prefer 1,200 foot pounds of bullet energy.
243 Winchester Hunting Ammunition:
Ammuntion: Hornady 243 Winchester Superformace 95 Grain.
Bullet Diameter: .243 Inch.
Bullet Weight: 95 Grains.
Bullet Ballistic Coeffecient: .355.
Rifle Barrel Length: 24 Inches.
Rifle scope mounted 1.8 inches above bore center-line.
Rifle bullet trajectory set at 2 inch mid-range rise.
Rifle true zero is 230 Yards.
Maximum point blank range is 267 yards.
Note: (FPS. = Feet Per Second.) (IN. = Inches.) (FT. LBS. = Foot Pounds.)
Range
Muzzle
100 yds.
200 yds.
300 yds.
400 yds.
500 yds.
Bullet Velocity / FPS.:
3,185
2,908
2,648
2,402
2,169
1,950
Bullet Trajectory / IN.:
- 1.8"
+ 1.7"
+ 1.1"
- 4.4"
- 16.1"
- 35.1"
Bullet Energy / FT. LBS.:
2,139
1,784
1,478
1,217
992
802
Deer Size Animals:
+
+
+
+
-
-


243 Winchester And Predator Hunting:
Predators Include: Bobcat, Cougar And Coyote.
These animals can be somewhat small and offer about an two inch target zone, for a correct rifle sight-in, a one inch mid-range is required for minimum bullet trajectory effect.
For this size animal, I prefer 360 foot pounds of bullet energy.
243 Winchester Hunting Ammunition:
Ammuntion: Hornady 243 Winchester Superformace 58 Grain.
Bullet Diameter: .243 Inch.
Bullet Weight: 58 Grains.
Bullet Ballistic Coeffecient: .250.
Rifle Barrel Length: 24 Inches.
Rifle scope mounted 1.8 inches above bore center-line.
Rifle bullet trajectory set at 1 inch mid-range rise.
Rifle true zero is 218 Yards.
Maximum point blank range is 248 yards.
Note: (FPS. = Feet Per Second.) (IN. = Inches.) (FT. LBS. = Foot Pounds.)
Range
Muzzle
100 yds.
200 yds.
300 yds.
400 yds.
500 yds.
Bullet Velocity / FPS.:
3,925
3,465
3,051
2,674
2,327
2,007
Bullet Trajectory / IN.:
- 1.8"
+ 0.8"
+ 0.4"
- 3.7"
- 12.6"
- 28.1"
Bullet Energy / FT. LBS.:
1,984
1,546
1,199
921
697
519
Predators:
+
+
+
+
+
+


243 Winchester:
Reloading
Hunting & Ballistics
50 Yard Sight-In
Rifles
Twist Effects
Model 70's
Hornady Ammo
Remington Ammo
Winchester Ammo.


Amazon.com:
The Hunter's Guide To Ballistics:
Caldwell Stable Table
Caldwell Lead Sled Plus Recoil Reducing Rifle Rest
Caldwell Ultimate Target Stand With Target Backer
243 Winchester