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Author Topic: Weak Texan HS?  (Read 1825 times)

Aceflier

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Weak Texan HS?
« on: December 11, 2016, 08:53:53 AM »
New rifle I have to crank the HS tension almost to the fist line to get 950fps from 168gr slug sized .457. From what I've read this doesn't seem normal. I can't find much info on the Texan at all. Anyone know the stock spring dimensions and weight? The first shot with stock setting at 2900psi was 355fps. I was teathered at 2900 while adjusting. Maybe valve lock and need a stronger spring?

Thanks for any help.
« Last Edit: December 11, 2016, 09:58:20 AM by Aceflier »


  • Indiana
1377 .177
Daisy 880
Ruger Blackhawk
'72 Dan
NP XL1100
.25 Mrod 75FPE (Stock parts mods by Shorty tuned by me)
Airforce Texan .457

Prouzy

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Re: Weak Texan HS?
« Reply #1 on: December 11, 2016, 09:48:39 AM »
Some folks were experiencing that similar issue in the beginning, I wondered if they had done something.  The mechanism in the cocking/hammer is different than the other Texans, you will see when you take it down.  With the shifting of the cocking effort/power wheel, people would experience valve lock, including myself with my first Texan.  I changed out the hammer spring for African Air Ordinance spring, which Jeremy created for this specific condition.  Here are my results:

http://www.gatewaytoairguns.org/GTA/index.php?topic=104926.0
http://www.gatewaytoairguns.org/GTA/index.php?topic=106863.msg1014607#msg1014607

Now, when I purchased my second Texan, I was anticipating having to do the same thing, however I had no issues filling to 3100psi on the stock set up.  I never shot it much at that level, not accurate, so most of my fills averaged 2700-2800, occasionally 2900psi.  This was my power wheel setting for round ball shooting mid 900s for the unmodded Texan:



Now, I also shot that typically filling 2400psi.  This was my setting (also on unmodded Texan)  for shooting Nielsen 372gr bullets 2700-2800psi and obtaining MOA @ 100yd for several groups, worst was just over 1.5in:





Aceflier

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Re: Weak Texan HS?
« Reply #2 on: December 11, 2016, 10:01:58 AM »
What's the serial number on your newer Texan?  Here is where mines at now.

  • Indiana
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'72 Dan
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Prouzy

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Re: Weak Texan HS?
« Reply #3 on: December 12, 2016, 05:42:10 AM »
Im no longer in possession of that rifle. Im sure you have, but did you shoot full strings with it?

Aceflier

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Re: Weak Texan HS?
« Reply #4 on: December 12, 2016, 06:36:00 AM »
Yes it shoots fine. Didn't have the air for more than the light 168gr sight in. Shot teathered from a 68ci bottle regged 3000psi down to 2500psi from 960fps to 913fps.
  • Indiana
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'72 Dan
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Airforce Texan .457

Prouzy

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Re: Weak Texan HS?
« Reply #5 on: December 12, 2016, 06:56:24 AM »
That looks correct, although if that with power wheel maxed, you will have difficulty shooting heavier. If you are into extreme accuracy, you need to try the Nielsen 372gr, its a great projectile that Ive seen shoot MOA in at least two different Texans, IIRC. Here is AAO: http://www.africanairordnance.com/424820687/product/1888495/magnum-hammer-spring?catid=625616

You may need to speak to Jeremy, but also check with Appalachian Airgunner, to get the correct one.  If Appalachian Airgunner has them, you wont pay $35 for shipping from SA  ;D I wish I had measured that spring, it was heavier and longer.

Aceflier

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Re: Weak Texan HS?
« Reply #6 on: December 12, 2016, 07:10:13 AM »
I sent A Airgunner an email through facebook.

I have Nicks 372gr didn't have air to test them. I'll wait for the new spring to try those.

And $28 and $35 shipping? Or is it $35 including shipping seems crazy for a spring lol.

Thanks brother!
  • Indiana
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Daisy 880
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'72 Dan
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Airforce Texan .457

Prouzy

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Re: Weak Texan HS?
« Reply #7 on: December 12, 2016, 08:30:02 AM »
I paid $15 for one spring and $35 for shipping from South Africa  :'(

So if Appalachian has them, should not be more that $6 or so for USPS flat rate, I would think. Unless three spring needs the $11, but much better than the combined $50 I paid for one spring LOL It was worth it because Jeremy was helpful in my progress and subsequently got other pellets to try in.

Aceflier

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Re: Weak Texan HS?
« Reply #8 on: December 12, 2016, 08:53:41 AM »
So I called airforce and they told me this is normal for the light pill and to try a heavier pill set to factory which was dead in the middle. I don't see how 335 fps with a light bullet is going to produce upper 700-800fps with a 372gr . I'm just going to wait for that and get the spring before I waiste more time and ammo.
  • Indiana
1377 .177
Daisy 880
Ruger Blackhawk
'72 Dan
NP XL1100
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Airforce Texan .457

Prouzy

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Re: Weak Texan HS?
« Reply #9 on: December 12, 2016, 09:30:41 AM »
Thats makes little sense, as the entire reason for the power adjuster is to tune on the fly for different projectiles.  I would guess if you back it off, there is no preload?  The new spring should remedy.  I need to get another one of those, such a fun rifle to shoot, and ow there is an aftermarket coming out  ;D

Aceflier

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Re: Weak Texan HS?
« Reply #10 on: December 12, 2016, 11:40:51 AM »
According to the manual it says less preload for heavier pills. Kinda backwards but airforce assured me that is correct.
  • Indiana
1377 .177
Daisy 880
Ruger Blackhawk
'72 Dan
NP XL1100
.25 Mrod 75FPE (Stock parts mods by Shorty tuned by me)
Airforce Texan .457

Prouzy

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Re: Weak Texan HS?
« Reply #11 on: December 12, 2016, 06:01:46 PM »
I know, not sure about how its working out :-)

grizzlyadams

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Re: Weak Texan HS?
« Reply #12 on: December 16, 2016, 11:40:18 PM »
less preload for the heavier pill is correct, because the heavier slug creates more back pressure on the valve, holding it open longer. it adjusts backwards from what you would think was normal. rb require more preload than slugs
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Aceflier

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Re: Weak Texan HS?
« Reply #13 on: March 30, 2017, 08:29:37 AM »
I've since installed the AAO spring and it's much improved. Power wheel just past first line to muzzle is getting 820fps with 345gr and 1010 with round ball at 3000psi. I also removed the auto safety while I had it apart. I'm going to order Bobs slug off accurate and give them a try since I have not seen any report on how they do.
  • Indiana
1377 .177
Daisy 880
Ruger Blackhawk
'72 Dan
NP XL1100
.25 Mrod 75FPE (Stock parts mods by Shorty tuned by me)
Airforce Texan .457

caniborrowsomeammo

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Re: Weak Texan HS?
« Reply #14 on: March 30, 2017, 11:56:14 AM »
What is the stock spring dimensions Aceflier?
E.g.- length, O.D., wire diameter, # of coils?
Buncha BB guns that I don't get to shoot as much as I like.