Are you talking about .17 HMR? That round does have a very flat trajectory, but it’s illegal to hunt deer in some states because it isn’t lethal and won’t penet

Are you talking about .17 HMR? That round does have a very flat trajectory, but it’s illegal to hunt deer in some states because it isn’t lethal and won’t penetrate vital organs (just like .22 rimfire.) .17 HMR is primarily used for shooting small game where precision and minimal damage are preferred.