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Compared: .17 Mach 2 and .22 Long Rifle
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By Chuck Hawks
The humble .22 LR is the most popular recreational shootingcartridge in the world. It has been a very long time since another cartridgeeven attempted to challenge the popularity of the .22 LR as a plinking andsmall game cartridge. (The last contender that I can remember was the nowobsolete .22 WRF, which never came close to unseating the .22 LR.)
Now, however, a new challenger to the .22 LR has emerged inthe form of Hornady's .17 Mach 2. The .17 Mach 2 is dimensionally the same asthe .22, but is loaded with a 17 grain, .172' diameter bullet at muchhigher velocity. This is the same bullet used in the startlingly popular .17HMR (Hornady Magnum Rimfire) cartridge. The .17 HMR transformed the almostignored .17 caliber from a fringe centerfire caliber into a mainstream rimfirecaliber and made the introduction of the .17 Mach 2 a commercially viableproposition.
This comparison article is worthwhile because bothcartridges are chambered in the same types and models of rifles. The .17 Mach 2was specifically designed to work in any firearm that can be chambered for the.22 LR and both cartridges are used for plinking, small game hunting and shortto medium range varmint shooting. The cost of factory loaded ammunition isalways important to shooters and these are the two least expensive smallgame/varmint hunting cartridges that are generally available.
.22 Long Rifle
The .22 LR that we all know and love was developed byStevens Arms in 1887. It was based on the .22 Long case charged with the same 5grains of black powder as the Long and loaded with a 40 grain bullet (insteadof the Long's 29 grain bullet). The result was a cartridge that offered similarvelocity to the Long, but hit small game much harder. The Long Rifle alsoproved to be more accurate than the Long and it has evolved into the worldsmost sophisticated and popular match cartridge. After the arrival of smokelesspowder, the .22 Long Rifle was adapted to the new propellant.
High Velocity .22 LR ammunition generally claims a muzzlevelocity (MV) of 1235 fps from a rifle barrel with a 40 grain, copper-platedlead round nose (RN) bullet and a MV of 1260 fps with a 36-37 graincopper-plated lead hollow point (HP) bullet (CCI figures). In 1977, CCIintroduced a 'Hyper Velocity' version of the .22 LR. This used alighter 32 grain HP bullet at an increased MV of 1640 fps without increasingthe maximum average pressure (MAP) of the .22 LR. The shorter 32 grain bulletallowed the use of a slightly longer case to increase powder capacity. TheStinger was the original and has remained the best known of the .22 LR HyperVelocity cartridges, although there are others. Hyper Velocity ammo generally retailsfor about 60-70% more than ordinary High Velocity ammunition.
The .22 LR cartridge is so popular that multiple loads are offered by every manufacturer of rimfire ammunition in the world. It is not only the most popular rifle cartridge in the world, it is also the most popular handgun cartridge. Its very light recoiland muzzle blast make it relatively easy to shoot in a pistol and its smallcharge of very fast burning powder means that it suffers less velocity lossthan almost any other rifle cartridge when fired from the relatively shortbarrel of a handgun.
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The .17 Mach 2 (.17 M2) was introduced by Hornady in 2004,following on the heels of their successful .17 HMR cartridge. The .17 HMR isbased on the .22 Magnum case, requires a rimfire magnum length/strength actionand retails for a substantially higher price than the .22 Magnum. The .17 Mach2 was intended to offer a less expensive .17 caliber rimfire cartridge withmany of the ballistic advantages of the .17 HMR that would function in existing .22LR actions.
The Mach 2 is based on a .22 LR Stinger case necked-down to accept the same 17 grain, polymer tipped, V-MAX bullet Hornady developed for the .17 HMR. One advantage of this projectile is its frangibility. This makes it safer than any of the .22 LR bullets for small game and varmint hunting in semi-populated areas. The lighter bullet and modern powders allow the .17 M2 to achieve a MV of 2100 fps (Hornady's figure--CCI claims 2010 fps) at the same SAAMI specified MAP as the High Velocity .22 LR. Among the major US ammo makers in 2008, the .17 Mach 2 cartridge is offered by CCI, Hornady and Remington.
The Comparison
For this article, we will select a representative load foreach caliber. There are about a zillion .22 LR loads offered in match, standardvelocity, high velocity and hyper velocity formats. The 'hottest' .22LR loads are the hyper velocity numbers, among which the CCI Stinger is thebest known. Therefore, to represent a .22 LR Hyper Velocity load we will usethe 32 grain CCI Stinger. On the .17 Mach 2 side we will use the CCI 17 grainV-MAX load, both for uniformity and because CCI provides the most completerimfire ballistics tables.
Unlike the .22 LR, the .17 Mach 2 has not been widelyadapted to handguns. It relies on high velocity for its terminal effectivenessand the relatively short barrel of a conventional revolver or autoloadingpistol simply entails too much velocity loss to allow the .17 Mach 2 to achieveanything like its full potential. For that reason, this article will comparethe .17 Mach 2 and .22 LR as rifle hunting cartridges.
We will compare these cartridges and loads in velocity,energy, trajectory, and bullet frontal area. Ammunition availability and priceare also factors that will be addressed. Recoil and muzzle blast are minimalfor both cartridges and therefore are not factors. At the end of the articlewill be a brief summary and conclusion. Let's begin!
Velocity
Velocity is an important factor when comparing riflecartridges, because velocity is the most important component in calculatingkinetic energy. Higher velocity also means a flatter trajectory, given bulletsof equal ballistic coefficient, which is another very good thing for the rifleshooter. Here are the velocity figuresfor our selected loads in feet per second, straight from the CCI 2008ammunition catalog, taken at the muzzle, 50 yards and 100 yards.
- .17 M2 (17 gr. V-MAX): 2010 fps MV, 1724 fps at 50 yards, 1471 fps at 100 yards
- .22 Stinger (32 gr. HP): 1640 fps MV, 1292 fps at 50 yards, 1066 fps at 100 yards
Those numbers speak for themselves. The .17 Mach 2 is clearly much faster than the fastest .22 LR Hyper Velocity load.
Kinetic Energy
Energy, a measure of the 'work' of which thebullet is capable, is an important component in killing power. Energy powersbullet expansion and penetration. Mathematically, the key components incalculating kinetic energy are bullet mass and bullet velocity squared. Here are the energyfigures for our two cartridges in foot-pounds.
- .17 M2 (17 gr. V-MAX): 152. ft. lbs. ME, 112 ft. lbs. at 50 yards, 82 ft. lbs. at 100 yards
- .22 Stinger (32 gr. HP): 191 ft. lbs. ME, 119 ft. lbs. at 50 yards, 81 ft. lbs. at 100 yards
As we can see from the numbers above, the extra bulletweight of the .22 has a significant impact in the energy delivered to thetarget. Not until both bullets have reached 100 yards does the higher retainedvelocity of the .17 M2 bullet allow it to equal the energy of the .22 Stinger.In terms of kinetic energy, there is little practical difference between ourtwo cartridges as applied to hunting small game animals.
Trajectory
The trajectory of a bullet is important because the'flatter' a bullet shoots, the easier it is to hit with downrange.Both the .17 M2 and the .22 LR are short range cartridges in the greatercontext of rifle cartridges, but it must be remembered that they are used toshoot very small animals, so minimizing the rise and fall of the bullet fromthe line of sight remains important. Here are the trajectory figures for ourcartridges, as supplied by CCI and based on a 1.5' sight height (a scoped rifle), measured in inches.
- .17 M2 (17 gr. V-MAX): -0.1' at 25 yards, +0.7' at 50 yards, +0.8' at 75 yards, +/- 0' at 100 yards
- .22 Stinger (32 gr. HP): +0.1' at 25 yards, +0.7' at 50 yards, +/-0' at 75 yards, -2.3' at 100 yards
These figures reveal the .17 Mach 2's biggest advantagecompared to the .22 LR. Its light, sleek bullet at higher velocity shootssignificantly flatter than any .22 LR load, even the hyper velocity Stinger.The difference in trajectory is negligible out to about 85 yards; beyond that,the .17 M2 is clearly superior and it offers about a 25 yard practical range advantage over the hyper velocity .22 loads.
Bullet Cross-Sectional Area
Bullet cross-sectional area is important because (otherfactors such as bullet expansion rate being equal) the larger the diameter ofthe bullet, the greater the area of the wound it creates (given the 100%penetration typical on small game animals). Obviously, it is better to punch abigger hole through a game animal. Here are the cross-sectional areas of ourtwo bullets in square inches.
- .17 M2 (17 gr. V-MAX): 0.0232 square inch
- .22 Stinger (32 gr. HP): 0.039 square inch
To no one's surprise, the .22 LR bullet makes a considerablylarger hole than the .17 M2 bullet. It should be noted that the .17 M2's V-MAXbullet and the .22 Stinger's CPHP bullet are both noted for violent expansionand create wounds that are much larger than the bullet's original diameter,resulting in very quick kills.
Ammunition Availability and Price
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This area is more subjective and will vary by geographicallocation. What can be said with certainty is that the .22 LR is the most widelyavailable cartridge in the world; nothing else even comes close. Small ruralgeneral stores that sell no other caliber or cartridge sometimes stock .22 LRammunition of one sort or another. In such areas, the .17 Mach 2 is probablyalmost unknown.
Generally, however, .17 Mach 2 ammunition is widelyavailable from gun shops and sporting goods stores, at least in the United States.The sporting goods department of the local Bi-Mart discount department store at18th and Chambers in Eugene, Oregon stocks a broad selection of .22 LRammunition (including the CCI Stinger) and a single brand of .17 Mach 2ammunition (Hornady). As I write these words, a 50 round box of .22 Stingersretails for $5.49 and a 50 round box of .17 Mach 2 runs $6.99. Less expensive.22 LR cartridges start at about $1.00/box. In both price and availability, the.22 LR has a big advantage.
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Summary and Conclusion
In terms of killing power on small animals, there isnot a lot of difference between the .22 LR Stinger and the .17 Mach 2. Atranges shorter than 100 yards, the Stinger is probably slightly superior to the.17 Mach 2. Beyond 100 yards, the Mach 2 is superior in killing power.
The .22 LR is a practical small game cartridge out to about85 yards, limited primarily by its rainbow like trajectory. The .17 Mach 2 isperhaps a 125 yard cartridge. If you find that you are often'stretching' the range capability of your .22, it might be time toconsider a .17 M2 rifle. For the same reason, the M2 would be the better choicefor shooting small varmints (non-edible animals).
While both cartridges are reasonably available in much ofthe US, the number and diversity of .22 LR loads far out numbers the available.17 Mach 2 loads. Likewise, .22 LR ammo is markedly less expensive than .17Mach 2 ammunition. This is a significant advantage for the .22 LR. Thebeginning shooter, who will of necessity burn large quantities of ammunitionlearning to shoot, will be better served by the .22 LR. It remains the cartridge of choice for targetpractice and plinking.
Although based on the same (Stinger) case and available in most of the same rifles, the .22 LR and the .17 Mach 2 fill slightly different niches as small game hunting cartridges. Both are accurate and effective for their intended purposes. Decide which factors are most important to you and choose wisely.