Haenel 311 target rifle: Part 2
by B.B. Pelletier
The Haenel 311 is the world’s only bolt-action, spring-piston 10-meter target rifle.
Let’s look at the velocity of my Haenel 311 target rifle. Because of the way it cocks, this rifle is low-powered. It isn’t possible to put a long-stroke piston or a stout mainspring in the mechanism when the rifle is cocked by pulling back on a three-inch bolt handle. You don’t pull it straight back, either. The base of the handle pivots like a fulcrum, and the handle rocks back to pull the piston into the cocked position. As I mentioned in Part 1, it’s so difficult to cock that the gun is destined for adults, only.
However, a short piston stroke and a weak mainspring combine to give very low velocity. Since this is a target rifle, velocity doesn’t matter. But this wouldn’t be the gun to choose as an all-day plinker. Get a Diana 27 for that, or any one of the Haenel breakbarrels. Save the 311 for its intended purpose.
If it sounds like I’m making excuses for the gun, that’s not what I want to do. I just want the reader to understand it in the right context.
Since this rifle has a leather piston seal, I dropped several drops of oil into the loading tap, then closed it and stood the rifle on its butt for several days before this test. For those who are new to airgunning, leather seals need lots of oil to do their jobs. Synthetic seals need a lot less oil, and it needs to be silicone chamber oil so it won’t detonate with the high heat it can generate.
In a rifle of the 311’s power, you can use plain old household oil for the seals, because the rifle doesn’t generate that much heat. But using silicone chamber oil won’t hurt anything, so that’s what I used. And there’s one additional reason for oiling the gun before shooting. The loading tap has to have some clearance to be able to move and do its job. When you oil the gun at the tap, some oil gets on the tap itself and helps to seal it when the rifle fires.
A note to the new reader. I test rifles with a range of pellets appropriate to that rifle. There will be a weight spread among the pellets I use, so you can gauge the power of the gun from what I use. But bear in mind that some pellets will work better in certain guns and the lighter pellet won’t always be the fastest. I also won’t test a gun with a pellet that I deem inappropriate for the gun, such as Beeman Kodiak heavyweight domed pellets for this target rifle. For a 10-meter target rifle, I’ll test with wadcutters since they’re the only pellets that are legal to use in a 10-meter match.
Let’s get right to it. The first pellet I tested was the Gamo Match wadcutter. This pellet used to be a viable and inexpensive pellet for target guns, but the design was changed a few years ago. While it’s still inexpensive, it doesn’t perform as well as it used to in many guns. Still, I thought it was worth a try.
This pellet averaged 462 f.p.s., but the spread was quite high — going from 439 to 479 f.p.s. At the average velocity, the rifle puts out 3.66 foot-pounds with this pellet. The wide velocity spread makes me think this one won’t be that accurate, but we’ll see.
Next I tried RWS Hobby pellets. At just seven grains weight, they should be among the fastest lead pellets in this rifle. Hobbys averaged 490 f.p.s. in the 311, and the spread went from 478 to 497 f.p.s. That’s tighter than the Gamo Match. At the average velocity, the energy developed at the muzzle was 3.73 foot-pounds. Sometimes, Hobbys are very accurate in certain guns and are worth trying in this one.
The last pellet I tried was the H&N Finale Match Pistol pellet. At 7.56 grains, you’d think they’d be slower than the Hobbys that weigh a half grain less, but these pellets averaged 492 f.p.s. in the 311, and the spread went from 480 to 501 f.p.s. They’re clearly faster and more efficient. At the average velocity, they produce 4.06 foot-pounds of energy at the muzzle.
Seeing the efficiency of this pellet gave me an idea. What if I used a pellet seater to iron out the skirts of this pellet? What would happen to the velocity then? I say that because a taploader tends to allow some air to blow past the pellets before they’re blown into the bore. Enlarging the skirts is a possible way to minimize this.
I tried enlarging the pellet skirts with the ball end of a pellet seater. However, the results surprised me. Instead of boosting velocity, this knocked it back to an average 474 f.p.s. for the H&N Finale Match Pistol pellets. However, the extreme spread ran only from 472 to 478 f.p.s., so the overall velocity was a lot tighter from shot to shot.
The bottom line is that the Haenel 311 is a target rifle and nothing more. Because of the design, there’s no way to soup it up for greater performance; and as I noted in Part 1, this is a rifle you want to stay out of.
Next time we’ll look at the accuracy of this Cold Warrior.