Just loves the 850 Airmagnum

Just loves the 850 Airmagnum

Joined: December 30th, 2006, 7:00 pm

March 18th, 2009, 9:25 am #1

Hi.
Iàm new to this forum, but I have read it for some time.

Got me a new 850 Airmagnum in cal 22. It is the XT model with silencer, bipod and Walther 6X42 AO scope.

Have tryed a bunch of different pellets, and it is clear that it shots best with H&N FTT 14 grn pellets.
Velocity with H&N FTT is ave 640 fts.

The longest distance I have used it is aprox 40 meters. With the FTT pellets it is a one hole shooter at 40 meters.
The scope it adjusted at 10 meters, and at 40 meters it shots aprox 8 cm lower than my aimingpoint.
But it puts all the 8 pellets in the same small ragged hole at 40 meters.

Iàm using it on CO2.

Iàm very pleased with the 850 Airmagnum. Just loves it

Thanks
Rune
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Joined: February 11th, 2007, 10:27 pm

March 18th, 2009, 6:56 pm #2

Welcome Rune!
I'm very glad that you like the 850
I also have a comensator, bipod and scope verison.
Please post a picture of yours.
Roald.

The 850 Store
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Joined: December 30th, 2006, 7:00 pm

March 18th, 2009, 10:02 pm #3

Hi.

I dont have a camera, and Iàm not any good with computers. I just surf the net and send e-mails. Thats about
all I use the PC for.

About my 850. Tryed it over the chrony with H&N Baracuda 21 grn pellets, and it shots them at ave 543 fts.
Temp at the time of testing was aprox 3 C or 35 F.
Lokking forward to the summer. Hoping for higher velocitys when the temp is around 25 C.

Iàm thinking of buying a 12 gram adapter for my 850, as I dont shot very ofthen, and I dont like to have the gun
standing with CO2 for a very long time.
Will the seals be harmed if I let the gun stand a month or more charged with CO2 ??

I have now shot around 150 pellets with my 850.
How many shots will I get from one 88 gram canister?? Thinking of both the total nr of shots, and the nr of shots
I can get with an even velocity.

Pardon my bad english. Iàm from Norway.

Thanks
Rune
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Joined: February 11th, 2007, 10:27 pm

March 19th, 2009, 3:09 pm #4

Heheh! don't worry about your English my friend, it's way better than my Norwegian
The 850 does not mind having CO2 in it all the time. Mine have not been "empty" one
for around 2 years now and it's still fine.
All the seals and o-rings are polyurethane and are not effected by CO2.

The 850 Store
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Joined: December 30th, 2006, 7:00 pm

March 20th, 2009, 1:42 pm #5

Hi.
Havent shot my 850 for some days, so I tryed it to day. The firing sound was low, so I tested it over the chrony.
The velocity was down to 460 fts, so I changed to a new CO2 bottle. The piercing pin (SP?) in the valve looks
like it has a pice of it broken of, but it still works as it has opened the new bottle.
I have screwed the bottle back a 1/4 turn so the CO2 can to flow better.

But now somthing strange has happend. The velocity is way down. It shots H&N FTT at ave 597 fts (before 640 fts), and H&N Baracuda
at ave 525 fts (before 545 fts).
This is only my 2nd CO2 bottle, and both was/is Walther CO2 bottles.

What has happend???

I have always left the gun unchocked when put away, so the hammerspring should not be afeckted in any way.

Any ideas on what to do?

Thanks
Rune
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Joined: February 11th, 2007, 10:27 pm

March 20th, 2009, 1:57 pm #6

I think the day that it was faster was hotter than the slow day?
Either that or now it's very much warmer than when you first shot it and youre getting a bit
of valve lock. 

The 850 Store
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Joined: December 30th, 2006, 7:00 pm

March 20th, 2009, 2:17 pm #7

Hi.
The temp last time was ca -3 C, and to day at the time of testing was 4 C.

Do you think that it can be the piercing pin (that has a pice of it broken of) that makes the low velocity?
Thinking maybe the CO2 flow is not normal as the hole in the bottle is maybe smaller.

I always leaves the gun unchocked (SP?) when put away, so the hammerspring will be fine.

If I get hold of a new piercingpin, is it easy to change?

I dont know what to do. If its not the piercingpin (SP?) then what can it be?

Thanks
Rune
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Joined: February 11th, 2007, 10:27 pm

March 20th, 2009, 2:52 pm #8

I don't think it is the pin, it's made of tool steel and very tough.
-3 is very cold for a CO2 gun, yore lucky it even works at all.
My .22 on CO2 will 720fps at 85F and 520fps at 40F and 480fps
at freezing 32F (14.3gr CP)
So I think your speeds are pretty good.  

You cannot get a new pin, you'll have to replace the whole valve.
But I really don't think it's the piercing pin.

The 850 Store
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Last edited by rbva on March 20th, 2009, 2:54 pm, edited 1 time in total.
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Joined: December 30th, 2006, 7:00 pm

March 20th, 2009, 3:15 pm #9

Hi.
You are right.
I was very coureous (SP?), so I rigged the chrony up indoors and let the gun get warm.
The velocity at my indoore temp (ca 21 C) was with RWS Superdome low 617 fts and high 622 fts.
With H&N FTT low 632 fts and high 635 fts. 30 sec between shots.
Dont know how I got so high numbers before at only -3 C.

Does this numbers looks ok for you at 21 C , or does your gun give higher velocitys at this temp?

Thanks
Rune
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Joined: February 11th, 2007, 10:27 pm

March 20th, 2009, 3:50 pm #10

Those look like good numbers to me. At around 70F
Depending on the lighting, chrony's sometimes "lie" or maybe the first time the CO2 and gun
were still warm? 

The 850 Store
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