243 Winchester, Reloading, Specifications And Data:
The popular 243 Winchester center-fire rifle cartridge originated as a wildcat based on the 308 Winchester brass necked down to .243" caliber, Warren Page developed the first prototype of this cartridge. Warren Page, then shooting columnist for Field & Stream magazine, was an avid wildcatter as well, had convinced many American hunters through his writings that his .243 caliber wildcats would effectively harvest varmints and deer as a combination cartridge. The 243 Winchester cartridge when compared to other .243" caliber cartridges does quite well ballistically
Winchester agreed and the 243 Winchester was made available as a factory cartridge to the public by Winchester Repeating Arms Company in 1955. Winchester chambered the 243 Winchester in their new Model 70 Featherweight bolt action rifle using a 22 inch, 1 in 10 inch twist barrel, offering 80 and 100 grain bullet loads. The 243 Winchester is the first true dual purpose class of hunting rifle cartridges and it is now among the top five most popular and widely available of all center-fire rifle cartridges in the world.
Part of the extreme popularity of the 243 Winchester is the fact that a rifle chambered in the 243 Winchester cartridge recoils very little to the shooters shoulder which adds to its over-all accuracy potential of which this cartridge is well known for. The greatest virtue of the 243 Winchester is that it offers a flat bullet trajectory for varmint hunting, predator hunting and has adequate killing power for thin skinned big game animals at a low recoil level that will help any hunter to shoot more accurately at greater distances.
Bullet Diameter = .243".
Maximum Case Length = 2.045".
Trimmed Case Length = 2.035".
Primer Size = Large Rifle.
Maximum Cartridge Overall Length = 2.710".
For the Antelope, Hog, Blacktail, Whitetail or Mule Deer hunter hand-loading or reloading his or her own 243 Winchester ammunition, Accurates Magpro rifle powder does an impressive job of launching 100 grain .243" diameter bullets at high velocity. Accurates online reloading data shows that a 100 grain .243 diameter Sierra Boat-Tail Gameking bullet using 45.2 grains of Magpro powder can be driven to a velocity of 2,861 feet per second, loaded at a maximum length of 2.650". This load does not top out until the 100 grain bullet is at 3,107 feet per second in the 243 Winchester at a chamber pressure of 59,880 PSI.
For the 100 grain bullet reload if you sighted your 243 Winchester deer rifle in dead on at 225 yards it would only be 2 inches high at 150 yards and only 2.9 inches low at 275 yards which would be an excellent deer load, this load still produces enough bullet energy at 350 yards to take deer with a remaining bullet energy of 1,235 foot pounds.
|243 Winchester Load Data:|
Test Powder Used = Accurate Magpro.
Test Bullet Used = Sierra / Type = Boat-Tail Spire Point / Brand = Gameking / Diameter = .243".
Test Primer Used = Remington 9 1/2.
Test Case Used = Winchester.
Test Case Trimmed Length = 2.035".
Loaded Cartridge Overall Length = 2.650".
Test Barrel Length = 24".
Test Barrel Twist Rate = 1 in 10".
|100 ||.242 ||.430 ||45.2 ||2,861 ||50.2 ||3,107 ||59,880|
|Short Range Ballistics Chart For Above Load:|
|Deer ||100 ||.430 ||3,107 ||2,143 ||0 ||- 2.7" ||- 5.8"|
|Long Range Ballistics Chart For Above Load:|
|Range: ||100 yds. ||200 yds. ||300 yds. ||400 yds. ||500 yds. ||600 yds. ||700 yds.|
||2,268 ||2,082 ||1,904
||- 18.2" ||- 37.0" ||- 63.8"
|Maximum Effective Range For Thin Skinned Big Game: 350 Yards.|
Maximum Effective Range For Predators And Varmints: 700 Yards.