Hatsan vortex pist&#111;n rebuild

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Topic: Hatsan vortex piston rebuild
Posted: 12 Jul 2022 at 4:38pm

Good afternoon all,

I just received my Hatsan fill probe to reseal my Hatsan vortex piston for my .25cal.

Quite an amazing design, from the looks they are assembled into the rifle un pressurized then pressurized to 145bar through the port, must make assemble a breeze compared to fighting against trying to compress the piston.

Just need to get 4 new O rings and ill report back once I have it back together and shooting

kruzaroad

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Posted: 14 Jul 2022 at 5:38pm

sweet. what's it like to shoot and how's the build quality?

Billbobnz

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Posted: 16 Jul 2022 at 8:37pm

Good evening.

Today was the day. Brought the O rings and replaced them in the brass end of the piston 8mm X 2mm if anyone else is going to rebuild theirs. Gave the O rings and piston a good lube with silicone grease, when I disassembled the piston I noticed that everything was almost dry. Reassembled everything and pumped it up to 150bar. First shot was perfect and only 1 inch down from the original zero at 40m so I must have got the scope back almost in the exact place! Put 10 shot through it and its running very smooth. Will shoot it through the Chrony tomorrow to see what speeds and consistency is like (originally was getting an average of 720fps with JSB kings)

Next up, a few mods for my Crosman 2250 is with the old tool maker down the road getting some tasty treats machined up, lets just say bulk filled with a twist........

Billbobnz

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Posted: 29 Jul 2022 at 12:49pm

Piles of starlings on the back lawn so decided to get the Hatsan .25 cal out instead of my modified CR600w that is my chosen choice for starlings. Picked out two starlings at 45m one looked like an adult and other a juvenile. Slocked the adult and the juvenile came back for a look on the fence and that got it too. Absolutely pleased how smooth this is shooting since the rebuild and accuracy at 45m is spot on.

Got my Webley and Scott .25cal in parts and will be rebuilding this over the next week so will do a comparison between the two once its up and running.

kruzaroad

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Posted: 29 Jul 2022 at 1:38pm

looks like the bunnies gonna be in trouble when ya go for them. expensive starling pellets. I'm glad it's preforming for you. You must be stoked that your effort has paid off.

Billbobnz

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Posted: 07 Aug 2022 at 4:00pm

Shot this through the chrony yesterday average of 728fps (original average from new was 720fps) so i must have done something right :) Next step is to check POI at 20yrd out to 80/100yrds

kruzaroad

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Posted: 07 Aug 2022 at 7:04pm

wow and I just take an educated guess. Which has of course has led to educated misses. lol. What set up is that?

Billbobnz

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Posted: 07 Aug 2022 at 7:25pm

There are alot of ballistic calculators out there. This is the Chairgun app which I find very user friendly. Check it out, let me know if you need a hand setting it up.

Billbobnz

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Posted: 07 Aug 2022 at 7:30pm

Another option if you dont have a chronograph, is get a big board of some sort, mark a aiming point, then start at 10yrds going out in 10 yrd increments per shot and measuring the POI for each 10yrds (always use the same aiming point for each shot) Once you get out to your maximum shooting distance (I go to 80m for my .25) you can use strips of electrical tape and place this horizontal along the board and go mack and see the POI through your scope are if you have milldot you can correspond these with them. Also take not of what zoom setting you use. I generally only use the lowest zoom setting if using milldots. (I hope this makes any sense) others will have other ideas

Edited by Billbobnz - 07 Aug 2022 at 7:32pm

kruzaroad

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