Part of a series of cartridges. This one is based on the 6.5 Rem Mag necked down to 6mm   

Older wildcat and is a rimmed version of the 6mm Remington   

The .244 Remington was introduced by Remington Arms Company in 1955 as a necked down version of the .257 Roberts. Rifles marked .244 Remington have a 1 in 12-inch (300 mm) twist and it presented a problem stabilising heavier bullets. It was rebranded by Remington in...

The 6mm PPC (Palmisano & Pindel Cartridge), was designed for benchrest shooting and is a necked-up version of the .22 PPC which is in turn based on a .220 Russian

   Match cartridge based on the 243 WSSM case with a rebated rim to fit the 6mm PPC boltface

   Ackley design specifically for single shot rifles and made from shortened 30-40 Krag cases necked to 6mm with a 28 degree shoulder.

Wildcat cartridge based on the NORMA BR case

American wildcatters began fiddling with the 6mm's after WW2. This is one of several versions that exist of these experiments and were popular with Bench Rest shooters. Based on the 250 Savage necked down, but differs from the Donaldson version as it retains the...

Harvey Donaldson of Fultonville NY is regarded as one of the fathers of modern bench rest shooting. This is one of several versions based on the 250 Savage case. The Donaldson version has a ¼" shortened case with the shoulder pushed back.   

The 6mm HAGAR was derived from the 30 Remington and it has the same case head diameter as the 6.8 SPC, also a 30 Remington derivative. The cartridge was developed by John Harrison, a prominent match rifle shooter and Sid Goodling, a well-respected bench-rest gunsmith...

New line of 5 cartridges based on the 30 M1 case. From the website: The Garin SureStrike System is a complete line of five highly efficient and accurate cartridges designed for varmint, small game and target pursuits. Differing only by specific neck diameter and...

The 6mm Dasher is an old wildcat caliber dating from 1999. During 2017, it was brought out by Norma as properly manufactured brass on the behest of American F Class shooter Shiraz Balolia, who has commissioned Norma to manufacture fully-formed 6mm Dasher brass, but it...

Relatively new, this is the 6.5 Creedmoor necked down to 6mm   

Match cartridge based on the 243 Win case with a 30° shoulder   

Wildcat based on the Remington Bench Rest case   

   Based on the 222 Remington Magnum case necked up to 6mm

   Wildcat by Gene Beggs of Odessa, TX on a modified 220 Russian case

Based on the 7mm Rem Mag necked down to 6mm   

Unknown belted round