Hatsan FlashPup .25 Cal Up to 80 Fpe

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BnHappy

BnHappy

Member
Apr 22, 2018
133
4
NC, United States
Playing with my FlashPup, I cleaned and deburred the action and turned out the hammer screw as far as I want it. I actually turned it out seven turns, this far it will cock but will not allow you to lock the bolt down in the back notch. I didn't like that so I turned it in one turn.

So, I wanted to see what kind of power I could get because I have plans on putting in a regulator, so I needed to know what it could push, thought I'd test some NSM slugs, 34.7 gr, 39 gr, 44, gr, and 55 gr. The fifty-five's were too slow, I figured as much, but the other three, they are definitely useable, this little thing amazed me shooting 905 fps (top speed) for 80 fpe with the 44 grainer. 

I was getting questions, others are working on theirs and not getting the power I am, at least I am not hearing from anyone else yet. I am wanting to do some more work on it when I go to put in the regulator, but I really don't wanna mess with anything if I've gotten a firecracker by luck, I'll throw in a regulator and leave it be.

So, to shut down skepticism, and the like I ran videos on all four, I then proceeded to have every technical issues you could think of, three videos ended up completely gone, but I managed to get the 34.7 grainer ran over the chrony with the numbers, pics of the chrony numbers I got, and my written notes where I got the most info in a video. I also got the best view from putting it on Youtube so I started a little channel to upload some stuff when I do it.

Anyone else out there turned up their FlashPup and seen what it can do? Here's the vid. 

https://youtu.be/QThwF_1iYUA


 
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Good job...once regulated that figure will be severely reduced due to a number of reasons, available shot volume and pressure. So whatever pressure you plan on regulating @, I would expect power to be around that.



FWIW a Flash pup *CAN* hit upwards of 100 fpe if one so desires...with extensive modification...getting 80% of the max power available is very impressive though! Not many modify their air guns that far. I am sure you know to obtain that last 20 FPE one would have to go full bore, have a retracting bolt probe, and over 50 gr of projectile. 

Thanks for sharing your work! My guess is your porting is roughly .1875"? 



-Matt




 
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If the "mods" you have done are just "Cleaning, Deburring and adjusting I have SERIOUS doubts that you are getting 80fpe from a Flash Pup.

First off the 100fps between shots is not good. How would you expect to get any accuracy beyond 10 yd with a spread like that?

Secondly the lighting of the Chrony is likely "causing" your 80FPE. Can't see how you have your overhead lighting set up but I would think, shining the light directly into the front sensor is likely effecting your readings.
 
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If the "mods" you have done are just "Cleaning, Deburring and adjusting I have SERIOUS doubts that you are getting 80fpe from a Flash Pup.

First off the 100fps between shots is not good. How would you expect to get any accuracy beyond 10 yd with a spread like that?

Secondly the lighting of the Chrony is likely "causing" your 80FPE. Can't see how you have your overhead lighting set up but I would think, shining the light directly into the front sensor is likely effecting your readings.
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I didn't even look at the vid, still haven't...if hes rocking a nearly stock Flashpup, you're probably right.
 
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You can believe as you wish, I did the video of all four NSA slugs, lost three of them due to tech issues, so I ran this one with my laptop. Yes I got 80 fpe with a 44 gr Nielson slug, I got pics of all of the chrony numbers on my tablet at the end of the video, along with handwritten notes from forgetting to start the chrony ap.

As for lighting, LED lights for indoor shooting, that's what's over my chrony, and it gives the same numbers outdoors, explain this please.

I have no reason to try to impress anyone in here, the point was to see what kind of power it had to see if it could push slugs, which is clearly explained on the video. I also know the spread is not good, I'm not tuning it to shoot at this power, I am seeing what it can do, and it impressed the hell outta me, and I don't care if you believe it. I'm disabled, my hands are screwed up, I have issues, I doubt I can even tune it completely, but I was able to clean the action out a bit and crank out the hammer screw six turns, which gave me these numbers. I won't waste any more of my lead to do it outside again either, I took my chrony over to a friends a couple of days ago so he could test his Gamo and Oh my, same kind of numbers after 7 shots. I put my lead away because I only bought a sample pack. I'm using a budget gun with a budget pump, a video that had to be done on a laptop, do you really think I can afford to have it tuned or buy the equipment to work on it? Oh, and I need to learn to work on it as well, done what I did from watching Youtube videos. 

All I can tell you is that if you have one try it for yourself, this is how mine works, it's right there in front of your face on a video.




 
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I haven't seen anyone who had posted anything about the numbers they were getting when they turned it up, most people are probably tuning specifically, which I honestly don't know much about yet, I am learning which is how I cleaned out the action and turned it up. 

Thank you for the info, I'm slowly learning from others, I know I can only get but so much power with a regulator, the gun has a small tube so I have to figure out where I want to set it. A lot of trying to figure it out is my hunting range, I don't really know it yet, basically because I had places to hunt, then lost them to land being sold, now it is a different area, much smaller, and I also want to use it in my yard because we have coyotes, hence the reason to see if it had the power to take them out at 50 yards or closer. I'm just playing with it to see what it can do, I'm super impressed with this thing. 
 
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Lol, definitely not stock, if you get one out of the box shooting this hot someone's made a mistake at the factory.

I'm finding good info here and there, amazed at the power the gun puts out. I am finding that there are plenty of snobs, trolls and, people who simply want to argue for whatever reason, which tends to be a good reason for new people to leave and not come back when they were simply trying to learn. I enjoy learning about how these things work, shoot, etc and simply posting what happened when I tried a little bit of tuning. I didn't expect the gun to shoot as hot as it does, I figured experienced tuners would get a kick out of it because I'm sure most people out there crank 'em wide open to see what they have when they first start tinkering with them. I wasn't expecting to be called a liar either, lol, it's a video, here's the numbers, no I'm not an experienced tuner, just showing what it can do, this is what I've done to it, and "boom" first responses say I'm lying about it. whaaaaaa?? Yeah, not much help with responses like that, wow, just wow.
 
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I know it’s not a .25. But just for a comparison shot string. My stock .22 Flashpup with no mods other than hammer spring adjustments at a 200 bar fill for 2 mags (24 shot average). This is my 18.13 gn tune. I did not retune for each pellet. So I am sure speed and energy would change considerably. This was just more for my wondering about changing pellet weight with out changing adjustments. 35 fpe for 24 shots out of a very accurate (for me) .22 cal. I am happy. 

JSB 18.13 gn = 920 fps = 34 fpe, 30 bar used

H&N fttg 9.57gn = 1107 fps = 25.7 fpe, 40 bar used

JSB 25.39gn = 788 fps= 35.0 fpe 40, bar used








 
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A word of advice from past failures...your valve stem is the weakest point at maximum hammer spring settings for most airguns. the pin will eventually break. Backing the fps down to the upper 800 fps range (regulated), with 30+ gr pellets/light slugs, can save you a lot of grief later, and greatly improve your shot count/accuracy. 

A coyote can be taken out at airgun ranges with a .25 caliber, muzzle fpe of 50+, using 30+ gr pellets/light slugs, and a head shot. A slug will take them out with a body shot, but they may not drop where they stand. They still die, it just isn't immediate. Been there, done that...prefer the head shot.

My .25 Taipan Veteran can hit 67 fpe with a 31 gr Barracuda pellet. I backed it down to 60 fpe, still plenty to take out small to medium game with a well placed shot. 

If you still need/want more power, I'd suggest the .30 caliber...but be careful, those slug guns can easily blow through windows and siding at airgun ranges! Neighbors hate that!

In your shoes, I'd get the Huma reg, set it at 140-145 bar, find what heavy pellet your gun shoots best, and pick up a night vision scope...the new digital ones can be had for under $400 today. You can shoot all night with that setup, and still make reliable kill shots on coyotes, feral dogs/cats, even head-shot hogs! (within reasonable airgun ranges) 

Not everyone will agree/appreciate what I've stated...this is just my experience, your mileage may vary. Comments/personal experiences always welcome!

Here's a video that I find interesting for shooting light to medium weight slugs in .25 cal: https://youtu.be/KFidpRJHz0Q
 
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Lol, definitely not stock, if you get one out of the box shooting this hot someone's made a mistake at the factory.

I'm finding good info here and there, amazed at the power the gun puts out. I am finding that there are plenty of snobs, trolls and, people who simply want to argue for whatever reason, which tends to be a good reason for new people to leave and not come back when they were simply trying to learn. I enjoy learning about how these things work, shoot, etc and simply posting what happened when I tried a little bit of tuning. I didn't expect the gun to shoot as hot as it does, I figured experienced tuners would get a kick out of it because I'm sure most people out there crank 'em wide open to see what they have when they first start tinkering with them. I wasn't expecting to be called a liar either, lol, it's a video, here's the numbers, no I'm not an experienced tuner, just showing what it can do, this is what I've done to it, and "boom" first responses say I'm lying about it. whaaaaaa?? Yeah, not much help with responses like that, wow, just wow.
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It's all in how you interpret the information. NO ONE called you a liar, I posted trying to HELP you letting you know the lighting was likely causing your errors. Maybe you are referring to another poster, but I didn't see where anyone called you a liar.

In one post you indicate that you can shoot 27 shots at that power level with the air pressure "in the green". The "Green" is from 200bar to 100bar. The air cylinder on the flashpup is 165cc. For you to get 27 shots at 80fpe on 100bar of air in a 165cc cylinder your efficiency would be 2.2fpe.cuin. Now I would never say that 2.2fpe/cuin is impossible, but in all of my time researching I have NEVER heard of anyone (experienced tuners or not) ever exceeding 2fpe/cuin

80fpe at an efficiency of 2.2fpe/cuin would be astronomical.

BTW-I've seen some guys who do extensive modding to the vales and ports in these guns and 65fpe is about as much as they are able to wring out of them. And then it's usually 10-15 shots.
 
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I was talking about another poster, sorry about that.

I know the rifle is not efficient at this level, and it's rough on it from what I've seen when taking it apart. It is getting 27 shots in the green, but you can see in the video that it's not gonna be good shots, if it ever stops raining and the wind trying to blow everything away when it's not I can get outside and test some more.

As for power, this is a pellet rifle and I realize that shot placement is key, I did want to know what it could do with the hammer spring cranked and be able to move it and work with it with different ammo. I know I'll end up putting a regulator in and it will not give that kind of power, but it will give plenty with enough shots to make me happy, without accuracy the power is useless. I'll be tweaking on this thing for a while during the learning process, I'm on tight budget, so I have to work on it accordingly. 

I do appreciate the advice and knowledge, and sorry about the mix up, I was talking about the other poster who immediately jumped in and said it wasn't true, it's not stock, more was done to it than that, nah, just what it does when I crank it up and cleaned out the action a bit. Been so bored not being able to play with it for the last month or so from the rain, ice, etc that I gave it a camo paint job to keep myself busy, lol.
 
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BnHappy said:
Not sure what psi it was, it was the tenth shot which puts the gauge around 165-170 after ten shots. With it turned up this high it will give me 27 shots in the green.
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Say what? So you are saying with a 160cc air cylinder….the first shot being 80 fpe….you are getting 27 shots ? 27 that actually exit the barrel ?
 
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