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It certainly is more powerful than 22lr Bob. It is actually a necked down 22Magnum case with a 17 caliber bullet. it actually has slightly better ballistics than a 22 magnum. Some good details here : https://www.youtube.com/watch?v=UF3mmbxAWnI

.17 HMR is like a 22lr on steroids it fits between the 22 mag and the 22lr