I can use it for a Rifle Shooting Merit badge for Boy Scouts.
If you go to a summer camp during the summer for scouts, perhaps they offer a rifle range to use and ammo to buy at a trading post? That's how I got mine. And my shotgun badge. Well, I almost had my shotgun badge, but then I left camp early due to some serious betrayal within the troop.
Anyway, if you can't find a rifle to buy yet, and you're in dire need of that merit badge, I suggest you speak with a scoutmaster about taking a trip to a rifle range at a nearby camp. Sometimes the camps open their rifle ranges for troops that ask for some time at their range. Of course you have to pay for it, I believe.