Quick Answer
The .264 Winchester Magnum and .270 Winchester have distinct terminal ballistics, with the .264 producing smaller, more controlled expansion, while the .270 produces larger expansion and more energy transfer.
Case Capacity and Muzzle Velocity
The .264 Winchester Magnum has a slightly longer case length and more generous powder capacity compared to the .270 Winchester. This results in a velocity difference of approximately 100-150 ft/s, with the .264 typically reaching 3,000-3,100 ft/s and the .270 reaching 2,850-3,000 ft/s. The increased velocity of the .264 contributes to its slightly flatter trajectory and greater kinetic energy at range.
Bullet Expansion and Weight Retention
The .264 Winchester Magnum is often loaded with lighter-for-caliber bullets, such as the 120-grain Nosler Partition, which can expand to 0.65-0.70 inches at 1,000 yards. In contrast, the .270 Winchester is often loaded with heavier bullets, such as the 130-grain Barnes TSX, which can expand to 0.80-0.90 inches at 1,000 yards. The larger expansion of the .270 results in greater energy transfer and more effective bullet penetration.
Hunting Applications
Both cartridges are well-suited for hunting medium-sized game, such as mule deer and pronghorn antelope. However, the .264 Winchester Magnum may be preferred for longer-range shots, due to its flatter trajectory and greater kinetic energy at range. In contrast, the .270 Winchester may be preferred for closer shots, where the larger expansion and more effective bullet penetration can be leveraged to take down larger game.
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