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 Post subject: Meet QbBob QB78 FT
PostPosted: Fri Dec 21, 2012 11:20 pm 
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Joined: Sun Nov 06, 2011 2:16 pm
Posts: 1631
Location: 1/2 Way From Ottawa and Montreal,
Well I started with a uber modded QB78 and added lots of stuff too it.
it started has a QB78 .25Cal that shot 950fps it was a ton of fun hit like a truck
would have made a great hunting rifle but I had other plans.

Sold the .25 LW barrel and bought a .177 LW barrel
A extended bolt probe, a bi-pod a AR2078 Thunb stock and painfully cut it.
I have instal a crazzy Scope on this its a copy of a great scope and it works great
for a copy let me tell you.
Its a ZOS 10-40X60 SF with big wheel and I have a sun shade for it, but with curent set up
it does not fit.

still lots of finishing to do on it and some tuning I will tune it for 780FPS with JSB's 8.44G
and use it for FT if I like how it shoots.

Image
Image

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 Post subject: Re: Meet QbBob QB78 FT
PostPosted: Sat Dec 22, 2012 12:03 am 
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Joined: Fri Dec 30, 2005 2:14 am
Posts: 1658
Location: Calgary, Alberta
Man, that is a nice rifle Frank!

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 Post subject: Re: Meet QbBob QB78 FT
PostPosted: Sat Dec 22, 2012 12:22 am 
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Joined: Mon Dec 29, 2008 3:22 pm
Posts: 2394
Location: Stavely, Alberta
Looking peachy Frank. How's she shoot?

DaveD :D

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 Post subject: Re: Meet QbBob QB78 FT
PostPosted: Sat Dec 22, 2012 11:22 am 
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Joined: Sun Nov 06, 2011 2:16 pm
Posts: 1631
Location: 1/2 Way From Ottawa and Montreal,
THANKS guys I will ajust it and crony it today.

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 Post subject: Re: Meet QbBob QB78 FT
PostPosted: Sat Dec 22, 2012 11:39 am 
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Joined: Sun Dec 16, 2012 10:51 pm
Posts: 361
Location: NB canada
i like it
i hope to someday be able to get a .177 sniper rifle for long range shooting
i don't know enough about it or can i afford one now
hopefully soon


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 Post subject: Re: Meet QbBob QB78 FT
PostPosted: Sat Dec 22, 2012 11:39 am 
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Joined: Sun Dec 16, 2012 10:51 pm
Posts: 361
Location: NB canada
i like it
i hope to someday be able to get a .177 sniper rifle for long range shooting
i don't know enough about it or can i afford one now
hopefully soon


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PostPosted: Sat Dec 22, 2012 1:58 pm 
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Joined: Sun Nov 06, 2011 2:16 pm
Posts: 1631
Location: 1/2 Way From Ottawa and Montreal,
So I work on it today ajusted it too 780fps at 10m. I would have like too ajust it more but one of my lights on my crony light kit
just stop working and I was not even shooting at the crony and no I did not hit the crony.

so this is not a real test since 10meters is not all that far, but at 10meters I'm shoting pellets in the same hole shot after shot 10 in a row no problem.
it's very good and my fps do no change more then 10fps and that is one of the reasons I bought QbBob it's shot string is flat across the the board from 3000psi
too 1200psi, this is a wonderful FT airgun, I have almost 1000$ invested in it,

I know I could have bought a Hammerli AR20 and would have shot about the same, but there is something I like of having something custom and from a cheap 125$
starting point,

and yes I will be selling some of my other great airguns to pay for this setup. Disco will be sold soon.

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 Post subject: Re: Meet QbBob QB78 FT
PostPosted: Thu Jan 17, 2013 10:03 pm 
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Joined: Sun Nov 06, 2011 2:16 pm
Posts: 1631
Location: 1/2 Way From Ottawa and Montreal,
QB78 Modded by rsterne
topic44979.html

Custom Bolt handle
No link.

NcStar AR/M16 Bipod for Weaver Rail
http://scopesandammo.com/storefront/pro ... rail-p-817




Lothar Walther Custom .177 cal Match Barrel QB78D/AR2078/AR2079
http://scopesandammo.com/storefront/pro ... 2079-p-821

Industry Brand/Shanghai Airgun AR2078LE Thumbhole Stock
http://scopesandammo.com/storefront/pro ... tock-p-835





QB/AR .177 Caliber Extended Probe Bolt
http://scopesandammo.com/storefront/pro ... bolt-p-648


now the tunning part, a bit tricky the RVA is very fine for .177 since this was a .25 build the RVA is a bit long to ajust I got to move it
very slow since it can move from 770fps to 850fps in just 1mm so took some time to ajust but I have it ay 785fps at 10meters from barrel
so this will be where it will stay for FT, rules say max of 12fpe and at 785fps with 8.44g pellets I'm under that,
I did not want it at 800fps since on a hot day I would be over now I have room to play.
But anyway this is a on site in the field ajustable take minutes to ajust now that I know I have to move it ever so little.
this has a shot string that is so close it's unreal 777fps to 785fps all the way from 3000psi too 1200psi since this is .177 I can go lower
in presur and still keep my fps in my original ajustement.

now if only there was no snow so I could go shot it outside 2 feet of snow in my yard.

I been trying to be accepted at my local gun club 50yard shoting range would help me to practice.

QbBob is has good has any FT airgun out there on a bench rest I would compeat anyone at 11 meters it's pellet after pelette in same hole.
get to be boring after a few hours why I need 25 yards to 50 yards to really try it out. this Lothar Walther in .177 is doing a fine job
and even after a few days this set up keeps its Zero after I added a 2nd barrel band.

now next on my list ............. LOL I spend too much on airgun last year and half. I got to sell some more.

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 Post subject: Re: Meet QbBob QB78 FT
PostPosted: Fri Jan 18, 2013 12:37 am 
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Joined: Fri Aug 24, 2007 9:21 pm
Posts: 2102
Location: Greater Napanee, ON, Canada
If your gun is shooting at 785 fps at 10M, it would be shooting at about 841 fps at the muzzle. The 12 ft/lb rule for WFTF applies to muzzle velocity and energy, not at 10 M.

Muzzle energy would be 13.25 ft/lb

The velocity has to be measured at the muzzle or close to it. Many set the chrony about 6 inches to one foot in front of the muzzle.

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 Post subject: Re: Meet QbBob QB78 FT
PostPosted: Fri Jan 18, 2013 12:20 pm 
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Joined: Wed Jan 05, 2011 12:35 pm
Posts: 5884
Location: P.G. B.C.
For testing them here, the fellows use a chronograph that straps to the muzzle with two velcro straps. It records records the velocity 1 1/2" from the muzzle. This chronograph uses any light it seems, including flourescent light and seems to work perfectly - English and about 60 pounds cost. One of the guys locally has this device. It's a bit of a pain to use as you have to write the speeds down as it displays them then re-set it for each shot - other than that, it's OK. With 2 people chronographing, it goes quickly.

That's quite a gun, Frank.

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 Post subject: Re: Meet QbBob QB78 FT
PostPosted: Fri Jan 18, 2013 12:29 pm 
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Joined: Sun Nov 06, 2011 2:16 pm
Posts: 1631
Location: 1/2 Way From Ottawa and Montreal,
1st I can ajust it in seconds. really. [ took some practice.

2nd I use a F1 chony and I'm sure it's calibrated to be used at 10meters or about that.

3rd I love this airgun it's one of the only 3 I shoot now QbBob Disco Alecto.

thanks for the warning I will read the set up and instruction for the F1 chrony
and re ajust it.

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Custom Design by ME PCP/HPA Air Carbine 10-50X60 Scope My 2018 FT Open


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 Post subject: Re: Meet QbBob QB78 FT
PostPosted: Fri Jan 18, 2013 12:52 pm 
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Joined: Sat Nov 03, 2007 4:19 pm
Posts: 8936
Location: Coalmont BC
A Chrony reads the velocity wherever it's at.... it's not compensated for a given distance....

Bob

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 Post subject: Re: Meet QbBob QB78 FT
PostPosted: Fri Jan 18, 2013 1:26 pm 
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Joined: Fri Jun 26, 2009 7:42 am
Posts: 4080
Location: Somewhere In Time
rsterne wrote:
A Chrony reads the velocity wherever it's at.... it's not compensated for a given distance....

Bob



X2

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 Post subject: Re: Meet QbBob QB78 FT
PostPosted: Fri Jan 18, 2013 7:40 pm 
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Joined: Fri Sep 09, 2005 11:55 am
Posts: 231
Location: England.
FRANK wrote:
I use a F1 chony and I'm sure it's calibrated to be used at 10meters or about that.


About 6 to 12" away, further than that speed will be dropping. Are you using a specific light source they are known to play up with varying light.

Lastly have you pressure tested that CO2 low pressure 1100psi max designed cylinder to 1 1/2 times intended operating pressure. You owe it to those around you.


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 Post subject: Re: Meet QbBob QB78 FT
PostPosted: Fri Jan 18, 2013 8:54 pm 
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Joined: Sat Apr 16, 2011 5:58 am
Posts: 495
Location: Eastern Ontario
Jon wrote:
Lastly have you pressure tested that CO2 low pressure 1100psi max designed cylinder to 1 1/2 times intended operating pressure. You owe it to those around you.


No problem at all using a QB/AR tube @ 1500-1800 psi.

Todd

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