Hatsan Jet I/II Discussion

[miksatx]

Didn't do to much better this morning got the spread to about 3/4" group. Pulled the barrel pushed some pellets through still had a tight spot. so cut off a 1/4" recrowned. Shooting much better with chps that's a plus.

Did you try with moderator removed?  I had similar poi issues with 2 of my 3 moderators p

Yes. All is good now. The last barrel mods seem to have did the trick. 

[naptemp]

Didn't do to much better this morning got the spread to about 3/4" group. Pulled the barrel pushed some pellets through still had a tight spot. so cut off a 1/4" recrowned. Shooting much better with chps that's a plus.

It seems that the Jet .177 stock barrels are not good for accuracy.

I do not have the skills to cut and recrown barrels.
If I buy one and it gives me more than 1 inch groups at 20 yards (pretty low expectations), Hatsan will have their gun back under warranty as many times as it takes.

[miksatx]

Well glad mine worked out, I'm amazed just how accurate it is now shooting RWS wadcutters from the mag.

[EdinGa]

My .25 is proving to be accurate beyond my expectations for sure.

[miksatx]

How far can you get into the trigger area? any way to lighten up this trigger?

[EdinGa]

How far can you get into the trigger area? any way to lighten up this trigger?

I'm pretty happy with the trigger on mine so I haven't tried to access it. The rest of the gun was an easy tear down though.

[Rat Sniper (AKA: PaulT58)]

I polished the contact surfaces and added a dab of grease, it helped a lot.  You could also swap the spring with a lighter one, or clip a coil on the one in there and that might make it lighter.  There is also an adjustment screw behind the trigger that can be adjusted ot shorten the length of pull of the trigger.

[miksatx]

I polished the contact surfaces and added a dab of grease, it helped a lot.  You could also swap the spring with a lighter one, or clip a coil on the one in there and that might make it lighter.  There is also an adjustment screw behind the trigger that can be adjusted ot shorten the length of pull of the trigger.

Thanks Paul for the pixs and info I'll get right on that.

[aimsmall]

my jet arrived yesterday, filled it, took 2 test shots and have left it alone to make sure it holds air. So far it appears to be holding steady.
Weather isn't so great but looking forward to punching some paper with it and dialing it in.
1st hatsan..

[aimsmall]

my jet arrived yesterday, filled it, took 2 test shots and have left it alone to make sure it holds air. So far it appears to be holding steady.
Weather isn't so great but looking forward to punching some paper with it and dialing it in.
1st hatsan..

I couldn't wait, went out in the sleet and put 2 clips thru it. Out of the box it was hitting the target without adjusting the sights.
Just flipped them up, pointed and shot. - right in the area I was aiming. Not bad imo for my weak eyes and my poor pistol form.
I wasn't trying to dial it, just wanted to put some lead thru it.
No issues with the air fitting and my setup either.
I am impressed for what it is.  Neighbor said it had a crack to it and sounded like a .22

[miksatx]

My j2 hammer spring bout the same OD as some of my old crosman disco/prod hammer springs. I grabbed an old cut down spring installed it dropped my fps 500/485. It started at 401 when first installed. The more rounds down range velocity worked up 500. It seems to like the 7.1g H&N hollow points best at that speed.

[naptemp]

My j2 hammer spring bout the same OD as some of my old crosman disco/prod hammer springs. I grabbed an old cut down spring installed it dropped my fps 500/485. It started at 401 when first installed. The more rounds down range velocity worked up 500. It seems to like the 7.1g H&N hollow points best at that speed.

I was looking at the Jet .177 too.

Do you have any shot string you like?
If you do can you post it here, at least the low/high, number of shots and start/end pressure.

[miksatx]

My j2 hammer spring bout the same OD as some of my old crosman disco/prod hammer springs. I grabbed an old cut down spring installed it dropped my fps 500/485. It started at 401 when first installed. The more rounds down range velocity worked up 500. It seems to like the 7.1g H&N hollow points best at that speed.

I was looking at the Jet .177 too.

Do you have any shot string you like?
If you do can you post it here, at least the low/high, number of shots and start/end pressure.

did these 8 shots
Bullet : 7.1 gr H&N

Shot count: 8
Low: 453
Hi: 500
Avg: 485
STD Dev: 14
Spread: 47

2023-12-31 14:37:44,500,FPS,3.9,FT Lbs,
2023-12-31 14:37:57,500,FPS,3.9,FT Lbs,
2023-12-31 14:38:08,493,FPS,3.8,FT Lbs,
2023-12-31 14:38:16,484,FPS,3.7,FT Lbs,
2023-12-31 14:38:22,488,FPS,3.8,FT Lbs,
2023-12-31 14:38:31,453,FPS,3.2,FT Lbs,
2023-12-31 14:38:37,485,FPS,3.7,FT Lbs,
2023-12-31 14:38:45,474,FPS,3.5,FT Lbs,
 all info i have for now.

[naptemp]

My j2 hammer spring bout the same OD as some of my old crosman disco/prod hammer springs. I grabbed an old cut down spring installed it dropped my fps 500/485. It started at 401 when first installed. The more rounds down range velocity worked up 500. It seems to like the 7.1g H&N hollow points best at that speed.

I was looking at the Jet .177 too.

Do you have any shot string you like?
If you do can you post it here, at least the low/high, number of shots and start/end pressure.

did these 8 shots
Bullet : 7.1 gr H&N

Shot count: 8
Low: 453
Hi: 500
Avg: 485
STD Dev: 14
Spread: 47

2023-12-31 14:37:44,500,FPS,3.9,FT Lbs,
2023-12-31 14:37:57,500,FPS,3.9,FT Lbs,
2023-12-31 14:38:08,493,FPS,3.8,FT Lbs,
2023-12-31 14:38:16,484,FPS,3.7,FT Lbs,
2023-12-31 14:38:22,488,FPS,3.8,FT Lbs,
2023-12-31 14:38:31,453,FPS,3.2,FT Lbs,
2023-12-31 14:38:37,485,FPS,3.7,FT Lbs,
2023-12-31 14:38:45,474,FPS,3.5,FT Lbs,
 all info i have for now.

Have you adjusted/tuned anything yet?
It cannot be that bad.

[miksatx]

My j2 hammer spring bout the same OD as some of my old crosman disco/prod hammer springs. I grabbed an old cut down spring installed it dropped my fps 500/485. It started at 401 when first installed. The more rounds down range velocity worked up 500. It seems to like the 7.1g H&N hollow points best at that speed.

I was looking at the Jet .177 too.

Do you have any shot string you like?
If you do can you post it here, at least the low/high, number of shots and start/end pressure.

did these 8 shots
Bullet : 7.1 gr H&N

Shot count: 8
Low: 453
Hi: 500
Avg: 485
STD Dev: 14
Spread: 47

2023-12-31 14:37:44,500,FPS,3.9,FT Lbs,
2023-12-31 14:37:57,500,FPS,3.9,FT Lbs,
2023-12-31 14:38:08,493,FPS,3.8,FT Lbs,
2023-12-31 14:38:16,484,FPS,3.7,FT Lbs,
2023-12-31 14:38:22,488,FPS,3.8,FT Lbs,
2023-12-31 14:38:31,453,FPS,3.2,FT Lbs,
2023-12-31 14:38:37,485,FPS,3.7,FT Lbs,
2023-12-31 14:38:45,474,FPS,3.5,FT Lbs,
 all info i have for now.

Have you adjusted/tuned anything yet?
It cannot be that bad.

Yes I replaced the oem hammer spring with a cut down spring to drop the fps from 800 to 500 fps. I’m detuning for more shots at lower fps.

[naptemp]

My j2 hammer spring bout the same OD as some of my old crosman disco/prod hammer springs. I grabbed an old cut down spring installed it dropped my fps 500/485. It started at 401 when first installed. The more rounds down range velocity worked up 500. It seems to like the 7.1g H&N hollow points best at that speed.

I was looking at the Jet .177 too.

Do you have any shot string you like?
If you do can you post it here, at least the low/high, number of shots and start/end pressure.

did these 8 shots
Bullet : 7.1 gr H&N

Shot count: 8
Low: 453
Hi: 500
Avg: 485
STD Dev: 14
Spread: 47

2023-12-31 14:37:44,500,FPS,3.9,FT Lbs,
2023-12-31 14:37:57,500,FPS,3.9,FT Lbs,
2023-12-31 14:38:08,493,FPS,3.8,FT Lbs,
2023-12-31 14:38:16,484,FPS,3.7,FT Lbs,
2023-12-31 14:38:22,488,FPS,3.8,FT Lbs,
2023-12-31 14:38:31,453,FPS,3.2,FT Lbs,
2023-12-31 14:38:37,485,FPS,3.7,FT Lbs,
2023-12-31 14:38:45,474,FPS,3.5,FT Lbs,
 all info i have for now.

Have you adjusted/tuned anything yet?
It cannot be that bad.

Yes I replaced the oem hammer spring with a cut down spring to drop the fps from 800 to 500 fps. I’m detuning for more shots at lower fps.

Even with a weaker hammer spring you get a 40 FPS spread across 8 shots in the 500 FPS range, and with a Jet 2 80 cc air tank?

Let us know how it goes.
Hopefully the shot string will get better.
The shot string stopped me from buying one, until I see someone having a reasonable shot string, that I can reproduce myself with my limited skills and tools.

[miksatx]

ordered a kral np01 .177 barrel fingers crossed that TP lines up in the breech. also have 2 weaker valve springs coming should be here in a couple days.

[naptemp]

ordered a kral np01 .177 barrel fingers crossed that TP lines up in the breech. also have 2 weaker valve springs coming should be here in a couple days.

How do you order Kral barrels?

[miksatx]

ordered a kral np01 .177 barrel fingers crossed that TP lines up in the breech. also have 2 weaker valve springs coming should be here in a couple days.

How do you order Kral barrels?

Ordered mine through https://canadashootingsupply.ca/

[miksatx]

Installed new valve spring also pulled the hammer spring and stretched the hammer spring. Stlll a work in progress.
Note Jet2
Bullet : 7.9 gr crosman

Shot count: 14
Low: 572
Hi: 592
Avg: 583
STD Dev: 6
Spread: 20

2024-01-05 08:01:46,586,FPS,6.0,FT Lbs,
2024-01-05 08:02:27,576,FPS,5.8,FT Lbs,
2024-01-05 08:02:52,573,FPS,5.8,FT Lbs,
2024-01-05 08:03:20,572,FPS,5.7,FT Lbs,
2024-01-05 08:03:41,581,FPS,5.9,FT Lbs,
2024-01-05 08:04:16,585,FPS,6.0,FT Lbs,
2024-01-05 08:04:46,574,FPS,5.8,FT Lbs,
2024-01-05 08:05:27,585,FPS,6.0,FT Lbs,
2024-01-05 08:06:16,588,FPS,6.1,FT Lbs,
2024-01-05 08:06:45,588,FPS,6.1,FT Lbs,
2024-01-05 08:07:15,585,FPS,6.0,FT Lbs,
2024-01-05 08:07:44,581,FPS,5.9,FT Lbs,
2024-01-05 08:08:12,590,FPS,6.1,FT Lbs,
2024-01-05 08:08:37,592,FPS,6.1,FT Lbs,