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7mm Remington Magnum / Reloading:
Written by: Kim Lockhart, Copyright.

7mm Remington Magnum Rifles:
 Rifles chambered in this round have a barrel bore land to land diameter of .277" and a bore groove to groove diameter of .2837".

Current bore rifling twist rates are 1 in 9 1/4" and 1 in 9 1/2".
Browning 7mm Rem. Mag. Hunting Rifles - 1 in 9 1/2" Twist.
Remington 7mm Rem. Mag. Hunting Rifles - 1 in 9 1/4" Twist.
Ruger 7mm Rem. Mag. Hunting Rifles - 1 in 9 1/2" Twist.
Savage 7mm Rem. Mag. Hunting Rifles - 1 in 9 1/2" Twist.
Winchester 7mm Rem. Mag. Hunting Rifles - 1 in 9 1/2" Twist.

7mm Remington Magnum Cartridge:
 The 7mm Rem. Mag. centerfire rifle cartridge is a .28" caliber, belted, bottleneck cartridge case design and reloadable.

7mm Remington Magnum History:
Remington introduced their new 7mm Remington Magnum cartridge to the public in 1962, this cartidge received great reviews by many as the bullets that could be used carried a very high ballistic profile promising a flat trajectory for long range hunting use in North America. Remington chambered the 7mm Remington Magnum cartridge in their Model 700 bolt action rifle in 1962 and it featured a 1 in 9" rifling twist. The 7mm Remington Magnum has been chambered by most major high power rifle manufacturers for quite some time and they have offered these rifles with rifling twist rates from 1 in 9" - 1 in 10". Because of the velocity range and quirky nature of .284" diameter bullets in that velocity range, the 7mm Remington Magnum will give varied terminal ballistic performance results with various rifling twist rates.

 The 7mm Remington Magnum has enough power, due in part to its large case capacity for powder, using 140 grain bullets it will drop deer at 500 yards, using 160 grain bullets it will take elk at 500 yards as well. This is truly an excellent big game cartridge for hunting all of North America's big-game animals. The 7mm Remington Magnum offers one of the best compromises of power, recoil and bullet selections of all high power class of rifles.


7mm Remington Magnum Performance & Comparisons:


243 Winchester vs. 260 Remington vs. 7mm-08 Remington vs. 308 Winchester.
25-06 Remington vs. 270 Winchester vs. 280 Remington vs. 30-06 Springfield.
264 Winchester Magnum vs. 7mm Remington Magnum vs. 300 Winchester Magnum.

7mm Remington Magnum Factory Ammunition Ballistics:
The below factory produced ammunition ballistics for the 7mm Remington Magnum were recorded from a 8.5 pound 7mm Rem. Mag. rifle with a 24 inch barrel.
7mm Rem. Mag.
Rifle Cartridge
Manufacturer
Bullet
Weight
Grains
Bullet
Ballistic
Coefficient
Muzzle
Velocity
Fps.
Muzzle
Energy
Ft. lbs.
Recoil
Energy
Ft. lbs.
Norma 125 .315 3,365 3,143 19.92
Hornady 139 .486 3,240 3,239 21.57
Remington 140 .486 3,175 3,134 21.24
Norma 150 .536 3,166 3,388 22.99
Hornady 154 .525 3,100 3,286 23.13
Norma 156 .330 2,953 3,020 22.16
Winchester 160 .512 2,950 3,092 22.82
Hornady 162 .550 3,030 3,302 23.93
Federal 165 .458 2,950 3,188 23.69
Nosler 168 .652 2,880 3,094 23.51
Norma 170 .378 2,953 3,292 24.60
Remington 175 .427 2,860 3,178 24.51

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

7mm Remington Magnum Rifles:
 Common barrel lengths for the 7mm Remington Magnum are;
22", 24" and 26", all of which will show a variance in the ballistics of the 7mm Remington Magnum.
 Variables such as riflescope choices, riflescope mounts and properly mounting your riflescope affect the line of sight above the bore centerline, which contribute to ballistic variances as well.
 To achieve maximum accuracy from your 7mm Rem. Mag. rifle for proper ballistic evaluation you need to, break-in your rifle barrel and then accurately sight-in your rifle.

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 (Terminal Ballistics):
 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 (External Ballistics):
 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 7mm Remington Magnum ammunition that categorize this ammunition to its practical use on various game animals for hunting at various distances.

Moose Size Animals Include: Grizzly Bear, Brown Bear And Moose. These animals are quite large and offer about an eight inch target zone, for a correct rifle sight-in, a four inch mid-range is required for minimum bullet trajectory effect.
For this size animal, I prefer 2,000 foot pounds of bullet energy.

7mm Remington Magnum Hunting Ammunition:
Ammuntion: Hornady 7mm Rem. Mag. Superformace 162 Grain.
Bullet Diameter: .284 Inch.
Bullet Weight: 162 Grains.
Bullet Ballistic Coefficient: .550.
Rifle Barrel Length: 24 Inches.
Rifle scope is mounted 1.8 inches above bore center-line.
Rifle bullet trajectory is set at 4 inch mid-range rise.
Rifle true zero is 292 Yards.
Maximum point blank range is 335 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.:
3,030
2,856
2,689
2,527
2,372
2,222
Bullet Trajectory / IN.:
- 1.8"
+ 3.1"
+ 3.7"
- 0.5"
- 10.2"
- 26.0"
Bullet Energy / FT. LBS.:
3,302
2,933
2,600
2,298
2,023
1,775
Moose Size Animals:
+
+
+
+
+
-

Elk Size Animals Include: Caribou, Black Bear, Sheep And Elk. These animals can be quite large and offer about an six inch target zone, for a correct rifle sight-in, a three inch mid-range is required for minimum bullet trajectory effect.
For this size animal, I prefer 1,800 foot pounds of bullet energy.

7mm Remington Magnum Hunting Ammunition:
Ammuntion: Hornady 7mm Rem. Mag. Superformace 154 Grain.
Bullet Diameter: .284 Inch.
Bullet Weight: 154 Grains.
Bullet Ballistic Coefficient: .525.
Rifle Barrel Length: 24 Inches.
Rifle scope is mounted 1.8 inches above bore center-line.
Rifle bullet trajectory is set at 3 inch mid-range rise.
Rifle true zero is 267 Yards.
Maximum point blank range is 312 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.:
3,100
2,915
2,737
2,567
2,403
2,244
Bullet Trajectory / IN.:
- 1.8"
+ 2.4"
+ 2.5"
- 2.0"
- 11.9"
- 27.8"
Bullet Energy / FT. LBS.:
3,286
2,905
2,562
2,253
1,974
1,722
Elk Size Animals:
+
+
+
+
+
+

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.

7mm Remington Magnum Hunting Ammunition:
Ammuntion: Hornady 7mm Rem. Mag. Superformace 139 Grain.
Bullet Diameter: .284 Inch.
Bullet Weight: 139 Grains.
Bullet Ballistic Coefficient: .486.
Rifle Barrel Length: 24 Inches.
Rifle scope is mounted 1.8 inches above bore center-line.
Rifle bullet trajectory is set at 2 inch mid-range rise.
Rifle true zero is 240 Yards.
Maximum point blank range is 290 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.:
3,240
3,033
2,837
2,649
2,469
2,295
Bullet Trajectory / IN.:
- 1.8"
+ 1.7"
+ 1.3"
- 3.3"
- 13.0"
- 28.3"
Bullet Energy / FT. LBS.:
3,239
2,840
2,484
2,166
1,881
1,626
Deer Size Animals:
+
+
+
+
+
+


7mm Remington Magnum / Reloading:

Rifle & Cartridge Information Sources:
 1. (SAAMI, Rifle Cartridge and Chamber Dimensions)
 2. (SAAMI, Rifle Cartridge, Velocity and Pressure)
 3. (Browning Rifles)
 4. (Remington Rifles)
 5. (Ruger Rifles)
 6. (Savage Rifles)
 7. (Winchester Rifles)
Ammunition & Ballistics Information Sources:
 1. (Black-Hills Ammunition)
 2. (Cor-Bon Ammunition)
 3. (Federal Rifle Ammunition)
 4. (Hornady Rifle Ammunition)
 5. (Norma Rifle Ammunition)
 6. (Nosler Ammunition)
 7. (Remington Rifle Ammunition)
 8. (Winchester Rifle Ammunition)

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The Hunter's Guide To Ballistics:
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