.177 vs .22 Air Rifle: One Equation Settles It

Kinetic energy is mass times velocity squared, which for pellets works out as energy in foot pounds equals grain weight times velocity squared, divided by 450,240. Run it backwards and you get the number that settles this argument: for a fixed energy, velocity falls with the square root of pellet weight.

So take one honest energy figure — 12 ft-lb, which is the common field standard for humane small-game shooting and roughly what a decent break barrel or multi-pump actually makes with lead — and one pellet family, so the comparison is fair. The JSB Match Diabolo Exact is published at 8.44 grains in .177 and 15.9 grains in .22: same design, same brand, nearly double the mass.

Those four lines are the entire caliber debate. The .177 buys you flight. The .22 buys you mass. Energy is identical by construction, because it is the same rifle.

“Flatter” is the most repeated claim in this argument and almost nobody puts a number on it. Here is the number, using the muzzle velocities above and simple free-fall over the time of flight — which ignores air resistance, so the real drops are somewhat larger and the gap between calibers a little wider.

Read that honestly in both directions. Three inches at 35 yards is a real difference and it is the entire case for .177 as a target caliber — less holdover to remember, fewer ways to be wrong. But one inch at 20 yards is not a difference that loses you a squirrel, and 20 to 25 yards is where most small game is actually shot with an air rifle. The .177 advantage grows with distance, and air rifle hunting should be shrinking distance, not stretching it.

These figures are drag-free arithmetic from published pellet weights at a stated energy level. They are not measurements, and they are not a substitute for mapping your own holdover card at 10, 15, 20, 30 and 40 yards — which is the exercise our air rifle sighting-in guide walks through, because a pellet flies a rainbow rather than a line in either caliber.

The muzzle is the easy half. What matters on an animal is whether the pellet stops inside it, because a pellet that exits took its remaining energy with it.

That last point connects to a question people ask after they buy: how loud is this going to be in a suburban backyard. Our quietest air rifles guide ranks the category on report, and PCP vs break barrel covers the powerplant decision that actually sets your energy budget before caliber divides it.

If you are buying one air rifle and you expect to shoot living things with it, buy .22. The three-inch trajectory penalty at 35 yards is a problem you solve with a holdover card and by getting closer; insufficient energy transfer on a raccoon is not a problem you can solve at all.

If you are buying one air rifle and it will mostly punch paper, shoot cans and teach a kid to aim, buy .177. The flatter arc makes it easier to learn on, the pellets cost less by the tin, and plinking is a volume activity.

If you are buying your second air rifle, buy the other one. That is not a joke — the two calibers genuinely do different jobs, and the cheapest way to cover both is two inexpensive rifles rather than one expensive one.

The C362 is our .22 pick and the top pick of this page. It is a multi-pump pneumatic at 35.6 inches and 4.5 pounds, and Crosman publishes 13 ft-lb of muzzle energy at maximum pumps. Independent testing has it averaging 611 fps with heavy 18.13-grain lead pellets, which works out to roughly 12 to 14 ft-lb— right at the common field standard for humane small-game shooting, and a useful demonstration that a rifle rated at 875 fps on alloy does not produce 875 fps with the lead you should hunt with.

Being a multi-pump matters as much as the caliber. There is no spring slamming forward, so there is no two-way recoil to fight and the rifle is materially easier to shoot accurately than a magnum break barrel at the same money. Honest cons: you pump it for every shot, which is slow and not quiet, and the energy depends on you doing the full pump count every time.

The Two-Forty is the .177 we would hand someone who wants to actually shoot well rather than chase a number on a box. Diana rates it at about 575 fps and 5.5 ft-lb with lead, and Hard Air Magazine measured roughly 555 fps with about a 7 fps standard deviation— which is the spec that matters and the one nobody advertises. Low power, low recoil, consistent, and a classic beech-stocked break barrel with the cocking effort of a rifle built in the last century rather than a magnum.

Honest cons: 5.5 ft-lb is a paper and tin-can energy level, not a hunting one. That is the point of the pick, but it is a real limit — do not take this rifle after squirrels.

If you want .177 with more energy than the Two-Forty for backyard pest work at short range, the Wildcat Whisper is the one in the registry we would choose. It is a conventional gas-piston break barrel with Gamo’s Whisper noise-dampening shroud, which is the feature worth paying for in a neighborhood where report, not power, is what gets you a conversation with a neighbor.

Honest cons: it is a springer, so it is hold-sensitive in a way the C362 is not — the artillery hold is mandatory rather than optional. And like every break barrel in this class, the advertised velocity is an alloy-pellet figure.

The honest limitation of a cheap .22 is that you are pumping or cocking for every shot. A compact PCP removes that entirely: fill the reservoir once, then shoot a magazine with no cocking effort, no recoil and far better shot-to-shot consistency. The Notos Carbine is the short, handy version of that idea — genuinely useful in a barn, a blind or anywhere there is no room to swing a full-length rifle.

Honest cons: it costs several times what the Prymex-class break barrels do, and a PCP needs a fill source — a hand pump, a tank or a compressor, which is a separate purchase and the real cost of entry. Our PCP compressor guide covers that side, and best PCP air rifles covers the tier above this one.

Here is the uncomfortable part of the caliber debate: the difference between a good pellet and a bad one in the same caliber is usually larger than the difference between calibers. A rifle has a pellet it likes, and finding it is worth more accuracy than any bore choice.

Note what the weight columns tell you about the whole argument: the heaviest .177 in that table (10.65 gr) is still lighter than the lightest .22 (14.3 gr). The calibers do not overlap, which is why you cannot split the difference with pellet choice — you have to pick a bore. Our air rifle pellet guide goes through head shapes and what each one is for.

The same arithmetic keeps working as the bore grows, and it changes what the rifle is for rather than just how it shoots.

If that is the direction you are heading, read our big bore air rifle guidefirst, because the first spec on a deer airgun is legal rather than ballistic — West Virginia, for example, requires .45 and a 200-grain bullet, while Virginia allows .35 and up for deer but prohibits pneumatics outright for bear and elk. Nothing on this page applies to that decision.

The same rifle, the same energy, two ways to spend it. The .177 spends it on velocity and buys you about three inches less drop at 35 yards. The .22 spends it on mass and buys you about 37 percent more momentum into the animal. Paper rewards the first trade; quarry rewards the second.

If you are buying one rifle for small game, buy .22 — the Crosman C362 is the one we would start with. If you are buying one rifle for targets, buy .177 and take the Diana Two-Forty. Then spend your next twenty dollars on three different tins of pellets rather than on a different caliber, because that is where the accuracy actually is.