Please Note: On the above picture, right side comparison picture, right is 6.5 Remington Magnum, left is 350 Remington Magnum

One Cartridge, not a box: 6.5 Remington Magnum,  new  production using New Remington brasscases with “R-P 6.5mm REM MAG” Head-Stamp” and loaded with a 120 grain JSP (Jacketed Soft Point) Projectile by PCI. Minor spots on some cases, new older stock, can polish if need.
Volume Discounts
One Cartridge  @ $ 4.99 ea.
Ten Cartridges @ $ 4.49 ea. (Save $ 5.00 over one cartridge) ½ Box
  20 Cartridges @ $ 3.99 ea. (Save $20.00 over one cartridge) 1 Box
  40 Cartridges @ $ 3.49 ea. (Save $60.00 over one cartridge) 2 Boxes

History of  Winchester cartridge: 6.5 Remington Magnum
The  6.5 Remington Magnum was introduced in 1966 for the Remington Model 600 Bolt-Action Carbine, Remington discontinued the carbines in 1971.
The cartridge was produced by necking down the 350 Remington Magnum, which was developed in 1965 for the same Model 600 carbine.
The cartridge produced more energy and velocity at the time then most 6.5 cartridges.
Remington has not made this item in a few years at the time of this writing.