TX200 and SHO Vortek Kit question

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Gilberca

Gilberca

Member
Feb 5, 2017
44
25
Darlington, MD, USA
All: 
I recently (5 Feb) installed a Vortek SHO kit in my new AA TX200 MkIII to primarily smooth out the twangy shot cycle.
I chronied the TX prior to install and just after installation of the Vortek kit. I'm using primarily JSB 14.35gr .22 pellets as they've been the most accurate in this gun for me. Original Chrony string avg was 684 fps (measured at 3ft from muzzle). After the Vortek spring kit install, the Chrony results were running in the 690's. After about 300 shots, the chrony results showed a marked decline in velocity. I'm now getting in the 660fps range with the same pellets at the same muzzle distance.
Has anyone else experienced declining velocities after a spring upgrade?
The lower velocities are consistent and shot strings are running Standard Deviations under 4. 
The gun has been torn down, cleaned, relubed and inspected for broken parts. None were found.
I'm using a Vortek Parachute seal on the piston. ARH breech seals and and ARH cocking shoe. There are is no air leakage at the breech.

Thanks in advance,
Cal
 
I just finished my Prosport .177 and do not have a chronograph, however my accuracy had a dramatic improvement with three JSB.s the 10.3 and two domed JSB's an 8.4 and a 7.3. I was shocked at the improvement both in accuracy and how much smoother it felt and sounded. The gun went from a 1" + birdshot pattern with all three to a very tight 1/4" and 3/8" at 25 yards with the same three pellets. Now I have not shot a gun for 20 years so I'm impressed. (I will practice more ) WhenI have chrono facts I will share.
 
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Something to consider is that when installing a new seal, or removing / reinstalling the piston, there will be a little extra lube in front of piston. You will get higher velocity until the excess lube is burned up. Once the lube and moving parts settle down velocity will be more consistent. I have found this to be the case with any type of seal. A very good book on air guns is The airgun from trigger to target By G. V. Cardew. 
 
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Spent the weekend shooting the TX200 and after spending about 5 hrs plinking and punching holes with it, I can now say its good to go.
I re-chronied it after about another 500 rounds and the JSB 14.35 velocities have crept back up a bit to 670fps and a solid 14+fpe. 
I guess I've been spoiled with the German guns as they are not hold sensitive, unlike the TX200. I shoot from a chair and use a tripod as a rest and I finally figured out the sweet spot for hold and trigger pull with it to maintain consistency. I also put on a scope level to help me with scope cant . The level REALLY helped dialing in the longer range shots. ( I have 2 sets of targets set up; one at 25yds and one at 35yds.) 
I do like shooting this rifle, but it is not very forgiving when it comes to maintaining a proper hold. 


 
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I've been considering getting an AA either the TX or Prosport for FT competitions. From what I had read it was supposedly not so hold sensitive in comparison to other springers. Also hearing that you felt the shot cycle needed smoothing out is also contrary to reviews. I would be rather pissed off to spend the monies an AA cost and find out it needed upgrading to shoot at the levels I was expecting. I am in No way doubting your findings. Sad we cant even trust what should be honest online reviews.
 
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