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The following ammunition cartridge ballistics information and chart can be used to approximately compare .300 Winchester Magnum vs .45-70 Government ammo rounds. Please note, the following information reflects the estimated average ballistics for each caliber and does not pertain to a particular manufacturer, bullet weight, or jacketing type. As such, the following is for comparative information purposes only and should not be used to make precise predictions of the trajectory, performance, or true ballistics of any particular .300 Winchester Magnum or .45-70 Government rounds for hunting, target shooting, plinking, or any other usage. The decision for which round is better for a given application should be made with complete information, and this article simply serves as a comparative guide, not the final say.
For more detailed ballistics information please refer to the exact round in question or contact the manufacturer for the pertinent information. True .300 Winchester Magnum and .45-70 Government ballistics information can vary widely from the displayed information, and it is important to understand that the particular characteristics of a given round can make a substantive difference in its true performance.
Caliber Type Velocity
(ft-lb) .300 Winchester Magnum Rifle 3030 3520 .45-70 Government Rifle 1680 2270
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As illustrated in the chart, .300 Winchester Magnum rounds – on average – achieve a velocity of about 3030 feet per second (fps) while .45-70 Government rounds travel at a velocity of 1680 fps. To put this into perspective, a Boeing 737 commercial airliner travels at a cruising speed of 600 mph, or 880 fps. That is to say, .300 Winchester Magnum bullets travel 3.4 times the speed of a 737 airplane at cruising speed, while .45-70 Government bullets travel 1.9 times that same speed.
Furthermore, the muzzle energy of a .300 Winchester Magnum round averages out to 3520 ft-lb, while a .45-70 Government round averages out to about 2270 ft-lb. One way to think about this is as such: a foot-pound is a unit of energy equal to the amount of energy required to raise a weight of one pound a distance of one foot. So a .300 Winchester Magnum round exits the barrel with kinetic energy equal to the energy required for linear vertical displacement of 3520 pounds through a one foot distance, while a .45-70 Government round exiting the barrel has energy equal to the amount required to displace 2270 pounds over the same one foot distance. As a rule of thumb, when it comes to hunting, muzzle energy is what many hunters look at when deciding on what caliber of firearm / ammunition to select. Generally speaking, the higher the muzzle energy, the higher the stopping power.
Again, the above is for comparative information purposes only, and you should consult the exact ballistics for the particular .300 Winchester Magnum or .45-70 Government cartridge you”re looking at purchasing.
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