The 17 Aguila is a newer cartridge introduced into the market during 2004 and is based off shortening down the .22 long rifle cartridges. The bullet diameter is .172" but fits on the shell casing due to its modified reduction of the neck. The cartridge was developed in conjunction by firearm manufacturer High Standard and ammunition manufacturer Aguila in 2003.
The 17 Aguila is a varmint round designed to have less expansion on entry to do less damage to the tissue of an animal. The bullet is a 20gr jacketed solid point round that travels at 1,850 ft/s. This allows for game hunters to salvage more edible meat off a carcass. The bullet is designed to fit into a .17 Mach II (17HM2) bolt action rifle with no modifications to the rifle, or changing out the barrel on a Ruger 10/ 22.
The bullet received little attention on the market due to two other rim fires that were also released into the market by manufacturer Hornady. The .17 Hornady gained traction and took over the market in rim fire casings after their release. The 17 Aguila did gain a following after varmint hunters noticed it had less expansion that allowed for more edible meat to be salvaged on game, while still staying accurate for well-placed shots.
The .17 Mach 2 Ammo is a rimfire cartridge introduced to the markets in 2004. The .17 Mach 2 Ammo is based on the design of the .22 Long Rifle Stinger Ammo, which was necked down to .17 caliber Ammo and using a cartridge weighing less than half of its weight. Since the .17 Mach 2 Ammo is based on the .22 Long Rifle Ammo, it only requires a barrel change to convert most bolt action firearms that can chamber the .22 Long Rifle Ammo to the .17 Mach 2 Ammo. To compensate and deal with the high-pressure requirements, conversion kits were created. The overall length of the .17 Mach 2 Ammo is 25mm, and the diameter of the bullet measures 4.4mm. The 17-grain bullet variant of the .17 Mach 2 Ammo travels at a velocity of 2,100 feet per second and creates an energy level of 166 ft.lbf.
The rimfire cartridge .17 Mach 2 Ammo was designed by Hornady in 2004 and manufactured by CCI/Hornady/Eley in the same year.
The .17 Mach 2 Ammo gives the varmint hunters a high-velocity rimfire bullet that can effectively shoot down ground squirrels and prairie dogs at ranges up to 220 yards.