Both 4.5mm (.177) and 5.5mm (.22) caliber air rifles have their own advantages and disadvantages, and which one is better for you will depend on your specific needs and preferences.
.177 caliber air rifles are generally considered to be more accurate and have a flatter trajectory than 5.5 caliber rifles. They are also better suited for target shooting and competition use. However, they generally have less knockdown power than 5.5 caliber rifles, which can make them less suitable for hunting.
On the other hand, 5.5 caliber air rifles tend to have more power and energy, making them better for hunting and pest control. They also have a larger pellet size, which can make them more effective at longer ranges. However, they are generally less accurate and have a more curved trajectory than .177 caliber rifles.
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