This is the predecessor to the 22-250 Remington. There was also an article in the Feb 1991 ECRA Journal that mentions the 22-250 Varminter in Australia as well. According to the notes it was "...Formed from the .250-300 Savage cartridge case by reducing the neck to...

   This is an "improved" 22 Hornet case that was shortened and necked to be able to use longer bullets.

   MARBLE SUB-CALIBER DEVICE. "MARBLE 22 HP WITH 22LR" STAMPED ON THE SIDE                          ...

   Another of the PDK line-up by Roy Winnett

One of the line of .22cal cartridges based on the 30 M1 Carbine case.   

The 22 Nosler was designed to deliver a more powerful option to existing AR platforms, capable of generating velocities of up to 3,350fps. All that is needed is to swop out the upper and use the 6.8 SPC magazine, while retaining the bolt carrier.   

      The .22 Niedner Magnum was developed in the early 1900's by Adolph O. Niedner, famous high-velocity cartridge designer credited among other things for the speedy .25 caliber wildcat that would eventually become standardized by Remington as...

   Based on the 218 Bee case. More info to follow

info to follow

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The DWS headstamp is my own. I have a delightful little 22 K-Hornet built by the late Alex Wilhelmi on a BSA 300 Sherwood Martini action. Made up from fireformed Sako 22 Hornet cases. The other headstamp was also made by OPM in South Africa

   PROOF   During WW2 there was a possibility that pilots could be shot down over some really inhospitable places. Early pilots carried personal handguns and rifles with them on long distance flights for protection. In WWI, pilots carried stripped down...

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...

   Bench rest cartridge based on the 6mm BR case, necked to .22 and the shoulder angle increased to 40°

The 22 Creedmoor has been around since 2014 and is a necked down version of the 6.5 Creedmoor. It was specifically designed to handle heavier 22cal. bullets instead of just making a 22 cal. to see how fast it could go.     

   The 22 CHeetah was developed by Jim Carmichel, shooting editor of Outdoor Life magazine and Fred Huntington of RCBS fame. It appears to have originated in the late 1970's. The cartridge is essentially a full length Remington 308 BR case, with a smaller...

The .22 CCC is the same as the .22 PMVF (Powell-Miller Venturi Freebore). With the success of the early Weatherby’s in the 1940’s, Roy Weatherby received a lot of input from wildcatter R.W. Miller, who at that stage was loading the 300 Hoffman Magnum after it was...

    The .22 Bench Rest Remington, commonly referred to as the .22 BR Remington, is a wildcat cartridge commonly used in varmint hunting and benchrest shooting. It is based on the .308 x 1½ inch Barnes cartridge, necked down to .22 caliber, lengthened by .020...

   This is the 6mm BR case that was necked down to .22cal. It is not the same as the 22 REMINGTON BR that is based on the .308 x 1½ inch Barnes case

   This is the 6mm HAGAR necked down to .22" with no other changes

Possibly one of the first wildcats ever made and dates from around the 1890's. It was developed by gunsmith Reuben Harwood and based on the 25-29 Single Shot case   

   These are found in different versions and configurations. This is the Ackley version with straight case walls and sharper shoulder.

   PROOF

The .219 Donaldson Wasp cartridge was developed during the late 1930s by Harvey Donaldson, and is derived from the .219 Zipper case. Once popular amongst match shooters in the 1940s it has since fallen by the wayside in favor of newer developments. It is however held...

  Developed as a joint venture between Hornady (cartridge) and Ruger (rifle). Based on the 222 Remington Magnum case.

Wildcat designed  by Todd Kindler, based on the 222 Remington that was shortened and given some Ackley treatment. VAR = Varmint, TARG = Target       

Based on the 222 REM MAG case, necked to .20 cal with sharper shoulder   

   Designed by Todd Kindler and is a 20-cal cartridge based on the .223 Remington necked down to 20 Caliber, with the shoulder modified to 30° and pushed back. The 2 logos are DAKOTA ARMS and LAPUA

   Match cartridge based on the 22 PPC necked down

   Designed by Roy Winnett of Minamora Illinois. PDK = Predator Dog Killer

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...

   221 Fireball case necked down to 20cal.

   Based on the 6mm BR case that was necked down to .20

   Third in the series by James Calhoon, this version is based on the 22 Hornet case.

   This is the second in the series by James Calhoon. This version is based on the 30 M1 Carbine case.

   Necked down and improved version of the 223 Remington case, capable of reaching 4,000fps.

   Popular wildcat from the 1960's. The late editor of Rifle and Handloader magazine, Dave Wolfe has been credited with the design of the 17-222 Magnum, although there were different variations on the same idea.

   By Zac Weighman. The idea is to get no residual powder left after firing

   In 2007 Remington Arms introduced a new rifle cartridge based on their 221 Fireball necked down to 17 caliber. Aptly named the 17 Remington Fireball, it is their version of the 17 Mach IV with minor changes from the original design in some areas.