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Ammo Hatsan Flashpup QE .177 caliber PCP: Part Two

Hatsan Flashpup QE .177 caliber PCP: Part Two

Hatsan Flashpup.

Part 1

This report covers:

  • The fill
  • Magazine
  • Velocity
  • JSB Exact RS
  • Sound barrier
  • RWS Superpoint
  • H&N Baracuda Match
  • Observation
  • The bolt
  • Where are we?
  • Summary

Today we look at the velocity of the Hatsan Flashpup QE. Remember that I am testing a .177-caliber rifle.

The fill

Hatsan has their own proprietary fill probe so I had to scrounge for an adaptor that has a universal male Foster fitting on the other end. Thankfully the threads on the Hatsan adaptor are male 1/8 BSPP and threaded into my adaptor perfectly. Hatsan — the world went to Foster quick-disconnect fittings several years ago. You need to get on board. 

The Flashpup fills to 200 bar which is ideal — none of this 3600 psi or higher pressure that isn’t required as long as the valve is designed properly and the owner has a reasonable expectation for a shot count.


I decided to use the magazine for today’s test. I’m glad I did because I uncovered a minor flaw in both mags that came with the rifle. They came from the factory with their transparent plastic covers adjusted too tight to operate but I loosened the screw that holds them to the thicker black plastic bottom and after that both mags worked fine.

Because the covers were too tight, I loaded the first mag incorrectly. It’s a mag where the first pellet has to be loaded skirt-first to block the pellet chambers from rotating backwards. I’ll have to find a way to rotate the black plastic bottom containing those pellets backwards so I can remove them.


Now I’ll test the velocity for you. I selected a lightweight pellet, a medium-weight and a heavyweight for the test. Let’s look at the lightweight pellet first.

JSB Exact RS

JSB Exact RS pellets weigh 7.33 grains and they are often some of the fastest pellets in this caliber. In the Flashpup they averaged 1137 f.p.s., but it was a bimodal distribution, meaning that no pellet actually went 1137 f.p.s. Look at the shots.


The spread was 126 f.p.s. As mentioned it was bimodal. Nothing went out in the 1130s, though that was the average. At the average velocity this pellet generates 21.05 foot pounds of energy.

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Sound barrier

As a result of the wide velocity spread, and of what happened with the other pellets, I got to see something I don’t think I have ever seen before — the exact velocity at which the pellets broke the sound barrier!

At 1104 f.p.s. the muzzle discharge was 94.2 dB. It was so quiet I thought the rifle had misfired or that the velocity was way too low.

Flashpup quiet
This was the Flashpup shooting a pellet at 1104 f.p.s.

At 1120 the Flashpup pellet broke the sound barrier.

Flashpup loud
This was the Flashpup shooting as pellet at 1120 f.p.s.

As you can see from the list I show above the JSB Exact RS did not exit the bore at a velocity between 1104 f.p.s. and 1120 f.p.s., so this was as close as I got with this pellet. But the second pellet I shot went out at 1105 f.p.s. and that one did break the sound barrier. Let’s see that now.

RWS Superpoint

The RWS Superpoint averaged 1105 f.p.s. The high was 1131 f.p.s. and the low was 1080 f.p.s. The spread was 51 f.p.s. and, while that is large, you can see that the distribution is not bimodal. At the average velocity this pellet generates 22.24 foot pounds.


And I mentioned that at 1105 f.p.s. this pellet went supersonic. It wasn’t quite as loud as the earlier one I showed that went out at 1120 f.p.s. and I didn’t have the sound meter on for all the shots, so there is no record of how loud it actually was, but I would guess no more that a couple dB quieter than the shot I did record that broke the barrier. It was certainly a lot louder than 94.2 dB.

This is the only time I have seen the exact velocity at which a pellet goes supersonic. And, since the speed of sound changes with the ambient temperature, air pressure and humidity, I may never see it again. It could change within a few minutes, depending on those three variables.

H&N Baracuda Match

The last pellet I tested was the 10.65-grain H&N Baracuda Match. I expected them to go slower and they did, averaging 985 f.p.s. The high was 1014 and the low was 952 f.p.s. — a spread of 62 f.p.s. At this velocity the Baracuda Match generates 22.95 foot pounds. Again, let me show you every shot.


The variation in this string was also quite large but certainly not bimodal like the first one. And that leads me to an observation.


In .177 caliber the Hatsan Flashpup I am testing is shooting a bit too fast — at least as far as I am concerned. Here is a lengthy and detailed comment reader ag72 left on Part 1 of this report.

“Hello all! My first post here and I thought I would give some advice/recomendations/ideas that I have found out with the 2 Hatsan Flashpups I have. They are built to leave the factory with high power and less shots, and that’s ok if you’re only gonna hunt and need a handful of shots for a trip. But if you want to use more shots, the power/speed will drop with each shot you take, so they aren’t fun if you want to shoot targets or plink, which I do. The good thing is it’s easy to double or triple the shot count, with a bit lower power of course, but with these you don’t hunt for moose or bear so you still have all the power you need to hunt birds or squirrels or any other small pests

You do need a chronograph, pellets and some tools and time but that’s part of the fun I think, at least when the result show better performance. As I said these deliver almost their max power from the factory, and, when you shoot a string through the chrony. you see the speed drops like a cliff for each shot.

What I did was buy a box of springs from the local hardware store. Then I took out the hammer spring. When I did that 2 washers fell out, so I removed them and tried again. Much better! Those two washers made the gun waste too much air because you get hammer bounce when the hammer return after the pellet is sent off. It slams into the spring/washer again and bounces back into the valve and opens it again, but now the pellet is on its way already so you waste that air. This can happen many times for each shot so you can hear the gun make a burp sound. Not effective! You can try with only the hammer spring and see how the gun performs, or you can look in the spring box to find one with the same dimensions and cut it a bit shorter. Or you can try some softer springs of the same length. Or find a shorter one that works for your need.

With this method I managed to get my .177 to shoot 60 JSB 10.34-grains between 190-100 bar, all between 244-254 m/s or around 800-834 f.p.s., then 11 more that dropped to 232 m/s at 80 bar. This will give a flat shooting well over 50 meters, and you most likely can make these numbers better with more time and brains than I have. In .22 caliber I have not found the best performance yet. I get 50 JSB 13.43-grains  between 150-80 bar at around 784-806 f.p.s. and 120 JSB Hades between 190-60 bar but with a wide spread of 120 f.p.s. I think I can improve that… /ag72″

The bolt

Okay, BB’s back. I found the bolt to be difficult to pull back. I couldn’t do it with the rifle on my shoulder. So I put the butt on my leg and it worked fine. But three times in this test I found that I had advanced the magazine but not cocked the rifle. That meant that a pellet was fed into the breech, so each time that happened I removed the magazine before taking the shot. After three times doing this I discovered that when the bolt came back the first click was the magazine advancing and the second was the hammer cocking. Once I learned that I never had another problem.

I suspect this addresses the issue several readers raised about how hard the bolt is to pull back. Both the bullpup design and the strength of the hammer spring conspire to make the Flashpup difficult to cock.

Where are we?

At the end of this test, which was 30 shots, the onboard pressure gauge that started at 200 Bar read 150 bar. I mention that so we can watch it when I next take up the rifle. Thus far, 30 shots have been fired on this fill.


In today’s test I discovered some minor issues with the circular magazines. Buyers need to be aware of what I discussed and read the manual before you try to load the mags.

I also discovered that the Flashpup is loud when the pellet breaks the sound barrier and quiet when it doesn’t. That means shooting heavier pellets is a requirement if you want to keep the rifle quiet. When it is quiet it is good for all but very small suburban back yards.

The large velocity spread makes me wonder about accuracy. I’d sure like to see a variance under 30 f.p.s.

I didn’t test or adjust the Quattro trigger for you today, nor did I give you a shot count. So this is not the last velocity test I’ll do.

author avatar
Tom Gaylord (B.B. Pelletier)
Tom Gaylord, also known as B.B. Pelletier, provides expert insights to airgunners all over the world on behalf of Pyramyd AIR. He has earned the title The Godfather of Airguns™ for his contributions to the industry, spending many years with AirForce Airguns and starting magazines dedicated to the sport such as Airgun Illustrated.

19 thoughts on “Hatsan Flashpup QE .177 caliber PCP: Part Two”

  1. Tom,

    I think Hatsan’s marketing researchers dropped the ball on this one. They not only did the bullpup version the lazy way by simply dropping the current action into the stock, they also did not make any instructions regarding power adjustments in the manual. Sure it shoots fast, but it is offset by the fact that you have to get it off your shoulder to cock. No easy way to shift the cocking lever because of the stiff springs being in the way. Hopefully it will be accurate enough to make up for it’s faults.


    PS: Section The fill 1st sentence
    Hatsan has their own proprietary fill probe so I had to scrounge for an adaptor that has a universal malw (male) Foster fitting on the other end.

  2. Bullpupa may be fine if you are a soldier. You get the bore in line with the shoulder (better recoil management) and the large distance between barrel and sight is not an issue because your targets are people sized and may be anywhere along the bullets trajectory bow anyway.

    And airgun has no need for recoil migitiation, and the targets are typically smaller than the distance between bore and line if sight in a bullpup. And you don’t shoot an airgun from inside an IFV or whatever.
    So my 50cent on that topic – bullpup designs offer no advantage in the airgun world.

    • Mel83,

      Even with inflation, I could only come up with 25 cents.

      The bullpup design in airguns allows for a longer barrel which allows the “report” to be quieter and allows the air to act upon the projectile longer, thereby increasing velocity.

      There are also those who will argue that a bullpup allows them to maneuver the air rifle in thick brush easier. What do they think they are doing in that thick brush, I do not know.

      The design also appeals to the couch commandos who want their air rifles and air pistols to look like “real” weapons.

    • Mel83-

      I have a flashpup in .177 and I have to say, it is a truly great squirrel/rabbit gun. Easiest air rifle I have to shoot offhand. It is accurate. Not a pellet picky gun. The first thing I did however was tune it down a little for a flatter shot string.

      Not a bench gun, not my most accurate gun, but a nimble shooter for the field. I’m super happy with mine.

  3. BB,

    Before I arrived at your summary, I had figured this air rifle had way too much of a spread to suit my accuracy desires. Of course, accuracy is a relative thing.

    Sound Barrier
    At 1104 f.p.s. the muzzle discharge was 94.2 dB. Ir (It) was so quiet I thought the rifle had misfired or that the velocity was way too low.

  4. Looks like this one is another victim of the ‘velocity sells’ mantra. I’m sure it can be made to shoot consistently with a bit of TLC but it shouldn’t really be necessary should it?

  5. To design a carbine with a long barrel seems like genius to me! 🙂
    But less so to name it ‘bullpup’, ie how close is ‘pup’ to ‘poop’ (or was it inspired by a literal bullpup)?

    I like the idea so much that I have tried to overcome my preference for the look of a traditional long arm layout, and this Hatsan Flashpup QE even has nice wood and metal (which I like), yet I think I’m too long in the tooth, ie I failed.
    Hmm, I want to end with an emoji but which one, 🙁 or 🙂 ?

  6. B.B. and Readership,

    So Hatsan doesn’t like Standardiztion it seems: “Hatsan has their own proprietary fill probe so I had to scrounge for an adaptor that has a universal male Foster fitting on the other end.”
    Couldmaybe that be a clue to the oversized Bores?
    Got any Hatsan pellets Tom?
    Any other Hatsan Brand shooters have and use Hatsan pellets? Do they fit the Hatsan Bore well?


  7. A little late, but regarding yesterday’s blog-I’ve seen some fixtures designed to increase pellet diameters on the airgun forums-unsure if it’s OK to post a link?…
    None made for sale, but for a fellow with a lathe they shouldn’t be too hard to replicate…

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