Hatsan 135 vortex .30cal
Printed From: Kiwi Airgunners
Category: General
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URL: www.kiwiairgunners.co.nz/forum_posts.asp?TID=565
Printed Date: 19 Apr 2025 at 5:42am
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Topic: Hatsan 135 vortex .30cal
Posted By: Excort
Subject: Hatsan 135 vortex .30cal
Date Posted: 04 Mar 2021 at 12:51pm
| Hey guys im trying to narrow down what could be caurseing my pellets to tumble possibly spiral i have done the pellet test pushing one down the bore and feeling the resistance and well its abit average at one point it feels like the pellet falls through the barrel but then gets tight before it leaves the marks on the pellets are pretty minimal none on the heads of the jsb 50.15 gr bit better on the polly mags tho but still not great could my barrel be oversized ? |
Replies:
Posted By: nunga
Date Posted: 05 Mar 2021 at 9:27am
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havning never had the 30cal to play with it is hard to say what is going on, I can tell you from my experience with JSB pellets that their heads are never tight in the barrel and when i measured the head size they are infact smaller than the skirt of the pellet. Not sure how many options you have with the 30 cal pellets but i would get a tin of something different and see how they go. ------------- 2nd place HP springer - WFTF World Championships 2014 |
Posted By: Excort
Date Posted: 05 Mar 2021 at 4:00pm
| Yeah there is not alot of options out there i did some more shooting today and with a new batch of the same pellets i was getting better groupings but then while cocking my gun my hand slipped on the barrel and it shot back up which resulted in bending my barrel bad enough to lift my point of impact by over a meter i have managed to straighten it but i feel a new barrel might be in this guns future. |
Posted By: dvlnme
Date Posted: 06 Mar 2021 at 4:18am
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waisted pellets are designed so only the skirt section engages the rifling,the nose is undersized so the nose rides in bore without engaging the rifling,this is normal,skirts are allso designed to be able to expand under pressure to fit and engage rifling and will expand to fit evan an oversized barrel and engage rifling,but if unrifled bore is larger than the nose section the pellet will essentually wobble down the barrel and exit barrel out of alignment,this system is all about keeping the pellet correctly aligned in the barrel,i doubt it matters if the nose is large enuf to engage the rifling as this will help keep pellet in correct alignment,but may effect velocity sightly by slowing the pellet down a little,cast bullets in firearms work in exactly the same way,in that the nose section of a cast bullet should not engage the rifling,i dont know if these rifles have a choked barrel,but if they do that may account for the tightness at muzzle,the loose spot in middle of barrel is bit of a worry tho as this will cause the skirt section to blow out more to fit this oversized section and would then mean skirt needs to once again swage down to fit the smaller section again,this will very likely cause pellet to get out of shape and not realign correctly again to the remaining barrel length,i doubt very much if the JSB pellets are the problem as these are one the most consistantly better pellets available,i allso doubt you will get a bent barrel dead straight again,so just going on what you have posted i tend to think the barrel may be faulty,it happens evan with the best guns every now and again,hope this helps. cheers mike
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Posted By: Billbobnz
Date Posted: 06 Mar 2021 at 3:02pm
| Bummer about your barrel, it must be faulty. Is it still under warranty? No one gets spare parts for these guns that I can find. Bummer about the bent barrel once they are bent they will always be a little weaker. |
Posted By: Excort
Date Posted: 06 Mar 2021 at 6:57pm
| Yeah pretty gutted about the barrel there are a few guys that re barrel them with lothar walther barrels so that might be a option but no idea what they are worth in regards to warranty i would say not as i have played around with the gun a fair bit but im not to worried its all a learning process ill get it as close as i can and see how it shoots might just become a close range gun till i find a replacement barrel on another note i am shocked at how short the barrel is on the .30 from memory i think i measured it at 270mm might aswell be a pistol haha |
Posted By: Billbobnz
Date Posted: 07 Mar 2021 at 4:21am
| Yes the barrel are short on these, I have the .25 version. Check ebay for barrel replacements as an option. |
Posted By: nunga
Date Posted: 07 Mar 2021 at 5:32am
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the barrels are short for a reason, the less time the pellet spends in the tight barrel the less the pellet will slow down and the faster it is...only problem is the pellet does not spin as fast so probably not so accurate over longer distances ------------- 2nd place HP springer - WFTF World Championships 2014 |
Posted By: Excort
Date Posted: 07 Mar 2021 at 2:21pm
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Yeah ill keep a eye out see what comes up could change to .25 if i can get a barrel an breech then changing over would be very easy. Barrel length makes sense would need alot more power to run a longer barrel only option there is PCP maybe one day
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Posted By: Excort
Date Posted: 08 Mar 2021 at 12:25pm
| hey guys got the barrel straight used a square looks pretty good gave it a really good clean inside and a polish with some light metal polish first 20 shots were really good grouping almost on top of each other and then it just went to sh*t pellets tumbling all over the show could i just need to put more pellets down the barrel try lead it up abit ? |
Posted By: Graywulf
Date Posted: 08 Mar 2021 at 6:55pm
I have a 125 Vortex .25 cal, same gun apart from the Calibre. I've had to re-zero it a few times. From the online 'researching' I did, they have all said these need a few hundred+ rounds down them to stabilise. I went for the .25 because it has a better pellet selection, and I watched a youtube review done by an ex USA 'armourer'. In reality the difference in FPE is very very small, and I know at 40yds my .25 cal hits damn hard.
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Excort wrote:Posted By: Excort
Date Posted: 09 Mar 2021 at 1:22pm
| Yeah in hindsight i would of gone for the .25 for pellet selection i would of easy put 500 plus pellets through my gun sometimes it shoots good sometimes it does not when i clean it it will shoot good for awhile i have read this is a common problem with big bore air rifles normally from a poor finish in the bore which results in lead fowling so i might try polishing the bore some more and see how it goes at the end of the day i dont have anything to loose in the state it is if in doubt ill get a new barrel eventually |
Posted By: Billbobnz
Date Posted: 09 Mar 2021 at 5:03pm
| Another thing to check is the breech, is it tight? My .25cal got very sloppy so had to fix it with some shim stock to take all the movement out. Since then it's been perfectly accurate. Check all the stock bolts for tightness too |
Posted By: Excort
Date Posted: 10 Mar 2021 at 11:54am
| Well you might be on to something there man i just checked mine and it moves in all directions that wouldnt be helping at all |
Posted By: Excort
Date Posted: 10 Mar 2021 at 1:14pm
| well i went over all the bolts and put lock tight on was good for about 15 shots then the breech got loose again the locking screw doent stop the bolt front turning whats this stuff you used to shim it like ? |
Posted By: Billbobnz
Date Posted: 10 Mar 2021 at 1:16pm
| Email me william.mascull@gmail.com I should still have some. I'm in Chch most days so could meet to give you some to play around with |
Posted By: Excort
Date Posted: 12 Mar 2021 at 5:48pm
| Hey guys just a update followed Billbobnz's advise and put some shims in the breech it was really loose so thats helped also noticed both front lens and rear lens on the scope are loose fixed the rear by putting some grub screws in there not going anywhere now but the front one i just carnt get the rings to turn to tighten up will the front lens be affecting my point of impact ? |
Posted By: Excort
Date Posted: 19 Mar 2021 at 1:01pm
Hey guys just a update fully taken the scope apart as i could not tighten the front lens without completely removing it the scope is a Hatsan scope i feel like they made up for there average tolerances with a heap of glue on almost all the threads everything had rattled loose so i put grub screws in the rear lens to stop that moving lock tight just was not enough front lens has been removed and lock tighted prettymuch everywhere i could so that should be good now and i also to two brass rods in under the spring that sits under the turrets as it was just sitting there and no doubt it would be working its way around with the recoil really hopeing for some good results but if not i at least had to try will test it over the weekend and see what happens hopefully post some decent groups :) 
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Posted By: Billbobnz
Date Posted: 19 Mar 2021 at 2:51pm
| Let us know how it goes, I've got a Hawke Scope to pull apart sometime to explore the workings sometime. |
Posted By: Excort
Date Posted: 29 Mar 2021 at 10:17am
| Hey guys still not shooting right unfortunately i feel like the scope is good now and i have put more shims in to the breech to make it even tighter, done some pellet testing on the barrel and its really tight at the breech end, where its been pressed in to the block 3 areas are worse than the rest one is from the barrel being bent so i am trying to lap the bore now has anyone got some ideas on what i could use for cutting compound i have auto soul but i would think i would need something with abit more grip in it ? cheers |
Posted By: Graywulf
Date Posted: 02 Apr 2021 at 9:26pm
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I know this is probably a ridiculous thing to suggest and ask, but, you are using the 'artillery hold' with the rifle? It took me a while to adjust to it, but the gun actually does shoot better than a normal 'rifle hold'.
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