There are numberous ones. The only limitation is your bank account.
50's or so
Yes, I can. A Barrett M107 is a .50 caliber sniper rifle.
For the J.C. Higgins Model 50 rifle, a popular choice for a one-piece scope mount is the Leupold Dual Dovetail Mount. This mount provides a sturdy and reliable platform for optics while maintaining the rifle's classic aesthetics. Additionally, it’s essential to ensure compatibility with the rifle's specific action type and scope tube diameter for optimal performance. Always check for specific fitment details before purchasing.
You need to give us some more information to answer your question- there are dozens of firearms that would fall under "50 rifle". If you mean a Barrett .50 caliber rifle, anywhere from $6,500 to $10,000- plus another $2000 for a scope.
It will require that the rifle be drilled and tapped for scope mounts. Some small rifles (usually .22 rimfire) can use a dovetail mount, but those rifles are made with the dovetail grooves, and they will not work with a heavy recoiling caliber. There are a very few scope mounts that use existing rear sight bases to mount the scope, but it will be very far forward on a T/C, and need a long eye relief scope. Your best course would be to have a smith do a professional D&T for your rifle- relatively cheap to do.
50 caliber
Yes
Any bullet that has a diameter of one half inch is a .50 caliber bullet. There are different .50 caliber bullets- my Hawken muzzle loading rifle shoots a .50 caliber lead bullet, but different from the .50 Browning Machine Gun (that is also used in the .50 Barret sniper rifle)
50-150
how far does a 50 caliber sniper rifle shoot accuratly
Over a mile.
In the States, a 50 caliber rifle can be acquired after filing certain tax stamps. Once the tax stamps are paid and a background check has been cleared, then a 50 caliber rifle can be purchased at some specialty gun stores.