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270 Winchester / Reloading:
Written by: Kim Lockhart, Copyright.

270 Winchester Rifles:
 Rifles chambered in this round have a barrel bore land to land diameter of .270" and a bore groove to groove diameter of .277".

Common bore rifling twist rate is 1 in 10".
Browning 270 Win. Hunting Rifles - 1 in 10" Twist.
Remington 270 Win. Hunting Rifles - 1 in 10" Twist.
Ruger 270 Win. Hunting Rifles - 1 in 10" Twist.
Savage 270 Win. Hunting Rifles - 1 in 10" Twist.
Winchester 270 Win. Hunting Rifles - 1 in 10" Twist.

270 Winchester Cartridge:
 The 270 Winchester centerfire rifle cartridge is a .27" caliber, rimless, bottleneck cartridge case design and reloadable.

270 Winchester History:
The 270 Winchester is based on the more popular 30-06 cartridge case necked down to .277" caliber. Winchester began producing the 270 Winchester in 1923. Although the 270 Winchester was in production in 1923 it was not officially announced until the introduction of their model 54 rifle chambered in their 270 Winchester cartridge in 1925, later it would be chambered in their famous featherweight model 70 bolt action rifle. The 270 Winchester is a great dual purpose cartridge it can be used for varmints sending a 110 gr. bullet out the muzzle at a sizzling 3,450 feet per second or it can be used as a big game cartridge sending 130 grain bullets out the muzzle at speeds of 3,100 feet per second with sufficient power out to the 400 yard mark for deer sized game plus using 140 grain bullets at 3,090 feet per second it will harvest an elk with bullet energy to spare out to about 350 yards.

 While much has been written about the 270 Winchester cartridge it truly is a great North American, big game cartridge. There are plenty of excellent bullet choices for handloaders and as of lately more factory ammunition choices are available in a variety of bullet weights as well. The 270 Winchester with the power it offers down range will recoil somewhat to the shooters shoulder with heavier bullets in the 150 grain range but is still tolerable to shoot. If the recoil bothers you to much just find a quality gunsmith in your area and have a recoil pad installed on your rifle or shoot reduced recoil ammunition.


270 Winchester 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.

270 Winchester Factory Ammunition Ballistics:
The below factory produced ammunition ballistics for the 270 Winchester were recorded from a 8.5 pound 270 Winchester rifle with a 24 inch barrel.
270 Winchester
Cartridge
Manufacturer
Bullet
Weight
Grains
Bullet
Ballistic
Coefficient
Muzzle
Velocity
Fps.
Muzzle
Energy
Ft. lbs.
Recoil
Energy
Ft. lbs.
Remington 100 .252 3,320 2,447 13.52
Cor-Bon 110 .323 3,450 2,907 15.98
Remington 115 .295 2,710 1,875 12.95
Norma 120 .314 3,250 2,814 16.75
Hornady 130 .460 3,200 2,956 18.34
Hornady 140 .495 3,090 2,968 19.48
Federal 145 .410 2,200 1,558 11.66
Winchester 150 .503 2,950 2,898 20.29

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

270 Winchester Rifles:
 Common barrel lengths for the 270 Winchester are; 22" and 24", all of which will show a variance in the ballistics of the 270 Winchester.
 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 270 Winchester 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 270 Winchester 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.

270 Winchester Hunting Ammunition:
Ammuntion: Winchester 270 Win. XP3 150 Grain.
Bullet Diameter: .277 Inch.
Bullet Weight: 150 Grains.
Bullet Ballistic Coefficient: .503.
Rifle Barrel Length: 24 Inches.
Rifle scope is mounted 1.8 inches above bore center-line.
Rifle bullet trajectory set at 4 inch mid-range rise.
Rifle true zero is 282 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.:
2,950
2,763
2,584
2,412
2,247
2,088
Bullet Trajectory / IN.:
- 1.8"
+ 3.2"
+ 3.5"
- 1.3"
- 12.1"
- 29.8"
Bullet Energy / FT. LBS.:
2,898
2,543
2,225
1,938
1,682
1,432
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.

270 Winchester Hunting Ammunition:
Ammuntion: Hornady 270 Win. Superformace 140 Grain.
Bullet Diameter: .277 Inch.
Bullet Weight: 140 Grains.
Bullet Ballistic Coefficient: .495.
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 265 Yards.
Maximum point blank range is 315 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.:
3,090
2,894
2,706
2,526
2,353
2,187
Bullet Trajectory / IN.:
- 1.8"
+ 2.4"
+ 2.5"
- 2.2"
- 12.3"
- 28.8"
Bullet Energy / FT. LBS.:
2,968
2,603
2,276
1,983
1,721
1,487
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.

270 Winchester Hunting Ammunition:
Ammuntion: Hornady 270 Win. Superformace 130 Grain.
Bullet Diameter: .277 Inch.
Bullet Weight: 130 Grains.
Bullet Ballistic Coefficient: .460.
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 235 Yards.
Maximum point blank range is 272 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.:
3,200
2,984
2,778
2,582
2,393
2,213
Bullet Trajectory / IN.:
- 1.8"
+ 1.7"
+ 1.2"
- 3.8"
- 13.9"
- 30.2"
Bullet Energy / FT. LBS.:
2,955
2,570
2,228
1,924
1,653
1414
Deer Size Animals:
+
+
+
+
+
+


270 Winchester / 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:
Caldwell Stable Table
Caldwell Lead Sled Plus Recoil Reducing Rifle Rest
Caldwell Ultimate Target Stand With Target Backer

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