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

270 Winchester Centerfire Rifle Cartridge:
 The popular 270 Winchester centerfire rifle cartridge is a commercial, rimless, bottleneck cartridge case design that is loaded commercially (factory produced ammunition) or reloaded by individual handloaders with various combinations of primer, powder and .277" diameter bullets. Handloaders can calculate the kinetic energies of their handloads with the use of these formulas.

270 Winchester Reloading Specifications:

Bullet Diameter - .277".
Primer Size - Large Rifle / .210" Diameter.
Case Neck Diameter - .308".
Case Shoulder Diameter - .441".
Case Base Diameter - .470".
Case Rim Diameter - .473".
Minimum Case Length - 2.530" / Trimmed.
Maximum Case Length - 2.540" / Stretched.
Minimum Cartridge Overall Loaded Length - 3.065".
Maximum Cartridge Overall Loaded Length - 3.340".

270 Winchester Reloading Data:
 For the Deer, Elk or Moose hunter hand-loading or reloading his or her own 270 Winchester ammunition, Western Powders, Accurate Magpro rifle powder does an impressive job of launching 140 grain .277" diameter bullets at high velocity. Ramshots online reloading data shows that a 140 grain .277" diameter Hornady Boat-Tail bullet using 57.0 grains of Accurate Magpro powder can be driven to a velocity of 2,808 feet per second loaded at a maximum cartridge overall length of 3.210" in the 270 Winchester. This load does not top out until the 140 grain bullet is at 3,062 feet per second at a chamber pressure of 64,603 P.S.I.. For the 140 grain bullet reload if you sighted your 270 Winchester hunting rifle in dead on at 225 yards it would only be 2 inches high at 125 yards and only 3.0 inches low at 275 yards which would be an excellent deer, elk and moose load.

270 Winchester Load Data And Ballistics Table
Test Powder Used = Accurate Magpro.
Test Bullet Used = Hornady - Boat-Tail Spire Point - .277" diameter.
Test Primer Used = Winchester - WLR.
Test Case Used = Winchester - 270 Winchester.
Test Case Trimmed Length = 2.530".
Loaded Cartridge Overall Length = 3.210".
Test Barrel Length = 24".
Test Barrel Twist Rate = 1 in 10".
Hornady
Bullet
Weight
Grains
Hornady
Bullet
Sectional
Density
Hornady
Bullet
Ballistic
Coefficient
Powder
Start
Load
Grains
Start
Load
Velocity
Fps.
Powder
Maximum
Load
Grains
Maximum
Load
Velocity
Fps.
Maximum
Load
Pressure
P.S.I.
140 .261 .486 57.0 2,808 63.3 3,062 64,603
Short Range Ballistics Table For Above Load:
Recommended
Cartridge
Usage:
Bullet
Weight
Grains
Bullet
Ballistic
Coefficient
Muzzle
Velocity
Fps.
Muzzle
Energy
Ft. Lbs.
Rifle
Zero
100 Yds.
Bullet
Drop
200 Yds.
Bullet
Drop
250 Yds.
Big Game 140 .486 3,062 2,914 0 - 2.7" - 5.9"
Long Range Ballistics Table For Above Load:
Bullet 100 yds. 200 yds. 300 yds. 400 yds. 500 yds. 600 yds. 700 yds.
Velocity Fps. 2,864 2,675 2,493 2,319 2,152 1,991 1,838
Energy Ft.lbs. 2,549 2,224 1,932 1,672 1,439 1,232 1,050
Trajectory + 1.4" 0 - 6.3" - 18.1" - 36.4" - 62.3" - 97.0"
Maximum Effective Range For Thin Skinned Big Game: 600 Yards.
Maximum Effective Range For Thick Skinned Big Game: 300 Yards.


270 Winchester Load Data Sources:
Hodgdon Reloading Data Center: The reloading data information displayed on this site, including ballistic data, was derived from tightly controlled laboratory conditions, by ballisticians and expert handloaders. Lists pressure test results as well. Features load data using Hodgdon, IMR & Winchester Rifle Powders.

Accurate Reloading Data Center: The reloading data information displayed on this site, including ballistic data, was derived from tightly controlled laboratory conditions, by ballisticians and expert handloaders. Lists pressure test results as well. Features load data using Accurate Rifle Powder. Accurate is an exclusive brand of Western Powders Incorporated.

Ramshot Reloading Data Center: The reloading data information displayed on this site, including ballistic data, was derived from tightly controlled laboratory conditions, by ballisticians and expert handloaders. Lists pressure test results as well. Features load data using Ramshot Rifle Powder. Ramshot is an exclusive brand of Western Powders Incorporated.

Barnes - 270 Winchester: Load data for the 270 Winchester featuring the use of Barnes bullets.

Nosler - 270 Winchester: Load data for the 270 Winchester using Nosler bullets. Features; varying case capacity and load density for each bullet weight and accuracy loads.

Norma - 270 Winchester: Load data for the 270 Winchester featuring the use of Norma rifle powders.

Vihtavuori - 270 Winchester: Load data for the 270 Winchester featuring the use of Vihtavuori rifle powders.

IMR - 270 Winchester: Load data for the 270 Winchester featuring the use of IMR rifle powders.


270 Winchester Reloading Equipment And Components:
Reloading Kits On Sale
At
(Amazon - Brownells - Cabela's - Sinclair - Sportsman's Warehouse)
.277" Diameter Rifle Bullets For Sale:
.277" Diameter Rifle Bullets
 Sponsor - Sinclair int.
270 Winchester Brass For Sale:
270 Winchester Brass
 Sponsor - Sinclair int.
270 Winchester Reloading Dies For Sale:
270 Winchester Reloading Dies
 Sponsor - Sinclair int.


Reloading Directory:
Bullets & Manuals
Powder & Data
Primers & Charts
Rifle Dies For Sale
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Rifle Bullets For Sale
Rifle Cartridges And Reloading - Rifle Cartridges And Ballistics