GTA
All Springer/NP/PCP Air Gun Discussion General => Air Gun Gate => Topic started by: Air Rifle Activities on March 24, 2017, 02:45:11 PM
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Hi, guys.
Has anyone measured the BC of the JSB Heavy Ultra Shock .22, 25.39 grains?
I tried searching on the web, went through some pellet BC databases, found nothing for this model…
I know the BC is relative, I only have one chronograph and hence cannot measure it.
Judging by the weight of the pellet and its shape, the BC should be close to 0.03.
I need an approximate estimate, even though made with another gun/barrel at another distance.
Thanks.
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I've seen their BC listed as high as 0.047.
http://www.network54.com/Forum/79537/thread/1460306933/Mini-review+of+.22+cal+JSB+Jumbo+Beast+and+Ultra+Shock (http://www.network54.com/Forum/79537/thread/1460306933/Mini-review+of+.22+cal+JSB+Jumbo+Beast+and+Ultra+Shock)
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Thanks, Dave :) I didn't really expect it to be this high, even given their weight, but of course their high BC has a lot to do with the powerful Air Ranger they were tested with ;) I doubt that I'll be able to achieve such velocities with my AGT Vulcan .22 bullpup, even at the highest power setting... I ordered the gun recently and I expect it to be here within the next 10 days; I need to start looking for a second chrono or keep searching on the internet.
I know it's a long shot, but still: do you think that the BC will drop significantly at a lower velocity of say 780-790 fps?
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BC is based on the retained energy from a reading taken at say the muzzle & then another reading taken further down range. If a pellet retains 80% of it's muzzle velocity (MV), at 25yds down range, it retains 80% regardless of velocity. Higher velocities actually aren't better for achieving a better BC. I believe best BC is achieved in the 800-850fps range.
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My experience is with the .177 JSB Ultra Shocks. In a 760 pumper, no less (along with my QB-79). They carry their weight well, meaning a good BC. And, even at low velocities, knock the bejesus out of the target with good accuracy.
I plan on buying a few tins as they shoot good out of everything I own- especially my 760 Pumper.
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Thanks to both of you :)
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Hi, guys.
Has anyone measured the BC of the JSB Heavy Ultra Shock .22, 25.39 grains?
I tried searching on the web, went through some pellet BC databases, found nothing for this model…
I know the BC is relative, I only have one chronograph and hence cannot measure it.
Judging by the weight of the pellet and its shape, the BC should be close to 0.03.
I need an approximate estimate, even though made with another gun/barrel at another distance.
Thanks.
HMMMmmmmm this is interesting. I have a few cases of JSB 25 grn Ultra-Shock, and 25.4 grn Monster. I have been handing out tins of either with the .22 Huben Semi-Auto Bullpup. My Ultra-Shock look VERY different in that they are almost perfectly cylindrical. Almost like the old Sheridan pellets with a large pin-hole in the middle. Mind you these are cases of older pellets, but I just ordered quite a few more cases. I hope the new Ultra-shock shoot as good as the old ones, and that the length and shape aren't an issue. I was thinking this would make a devastating ground squirrel pellet.
So far, the old Ultra-shock has excellent accuracy at 960 F/S. I can crank it up to over 1100 F/S, but don't, as the neighbors will surely call the police, thinking it is a firearm going off. I'd like to take it out squirrel hunting and just let it rip, to see how fast one can shoot one of these accurately (minute of squirrel) at 75-100 yards.
Wonder why they changed the shape? It's 4AM Sat, but I will take a picture and post a picture of the old pellet when I go in the shop Monday.
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(http://i36.photobucket.com/albums/e40/Habanero69er/003_zpsa427lrzo.jpg) (http://s36.photobucket.com/user/Habanero69er/media/003_zpsa427lrzo.jpg.html)
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Habanero, After lookking at your photo, maybe mine aren't so different, and it was just the angle of the photo in the OP. Will need to go to the shop and see.
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Joe, that pic was taken about a year ago. So maybe they have changed. The one in the pic came in a black labeled tin. I just got a couple more tins last week & they are in a purple labeled tin. Let me pop open one of the new tins & take a look see.
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That would be a good pellet for hunting Coyote in the right gun.
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Here is the "black" & "purple" label versions. Looks the same to me.
(http://i36.photobucket.com/albums/e40/Habanero69er/002_zpsdpvrouio.jpg) (http://s36.photobucket.com/user/Habanero69er/media/002_zpsdpvrouio.jpg.html)
(http://i36.photobucket.com/albums/e40/Habanero69er/003_zpsxt5wpnac.jpg) (http://s36.photobucket.com/user/Habanero69er/media/003_zpsxt5wpnac.jpg.html)
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I think they only changed the design of the tin.
I will send an e-mail to the manufacturer and ask if they had measured a BC. I know h&n do. And yes, it is a very good hunting pellet. Airgunners say one of the most accurate expansion pellets on the market.
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Habanero, I have them in the black tins. Quite possibly it was just the angle of the photo in the OP that threw me off.
Thanks buddy.
p.s. I am going to post a special GTA JSB Discount on my Vendor Gate, so keep an eye out for it.
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Habanero, I have them in the black tins. Quite possibly it was just the angle of the photo in the OP that threw me off.
Thanks buddy.
p.s. I am going to post a special GTA JSB Discount on my Vendor Gate, so keep an eye out for it.
I believe you're right Joe.
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I was showing and shooting the Ultra-Shock pellets in Huben Sunday with a customer, so I had a chance to snap a picture and upload. I think JSB took a little poetic license with the drawing showing in the OP. In the drawing in the OP, the hollow point is much larger, (sorry, didn't take this at an oblique angle as I should have) and there is angle at the top of the pellet (whereas mine and the others are more cylindrical). Not sure how to put that in better words other than "more cylindrical" with less of shoulder. but you can see it doesn't taper toward the front, as in the drawing. That's what threw me.
In short, mine (and I think all?) are more cylindrical, and the hole for the hollow point is much smaller than in their drawing.
(http://www.airtanksforsale.com/JSB/JSB-Ultra-Shock.jpg)
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The tail "flair" isn't as pronounced as the tin picture either.
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The tail "flair" isn't as pronounced as the tin picture either.
Yes, the waist is longer than portrayed in the drawing.
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It's like a caricature of the actual pellet. ;)
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I e-mailed the manufacturer. They apologized and explained that they hadn't tested this particular pellet yet.
About the 0.047: I used Alan's test data in several BC calculators. The results were always in the range 0.019~0.022. Try the calculators of AoA or Pyramydair, for instance. There is something wrong with his calculations, I'm afraid.
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Ivan, you're right. No where near .047. Not sure where he got that number. I should have checked that myself before posting the link.
My apologizes. :-[
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No, Dave, you don't have to apologize, there's nothing to apologize for! :) :) You've been very helpful, I learned from your posts plus I'm grateful that you replied at all. Certainly, anyone would assume that if someone is proficient enough to start writing a review and measure pellet velocities at different distances, that someone would have the common sense to use a verified ballistic calculator ;)
Maybe there was something wrong with the Hawke Chairgun app he was using or the data input was incorrect... Btw, in my opinion the case is the same with the BC of the JSB Beasts .22... The number he indicated is getting too close to the ones of firearms projectiles.
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I reran the Beast BC & with the velocities he supplied, the BC is .052-.055, which still isn't too bad for a pellet but no where near what we thought it was. :P
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Yes, Dave, .052-.055 must be correct. 0.050-0.055 is the BC of the JSB Exact King Heavy .25, which, I'm sure you are aware, is technically the same pellet design and the same weight as the Jumbo Beast, only larger caliber.
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Beasts are in and Habanero will be the first to get his.
:-)
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Joe, what are the head, waist and skirt diameters on this beast of a pellet? Also, overall length?
People talk about skirt depth. What about the skirt thickness about 1 mm from the back?
Pics of the nose and tail would be appreciated.
Are dings in the skirt, like the one in the picture typical?
(http://www.airtanksforsale.com/JSB/JSB-Ultra-Shock.jpg)
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You're still on the fence about these? You can compare the Ultra Shock to the other pellets in the picture if you're worried about length.
L to R: 18g JSB, Ultra Shock, 32g Eun Jin, 34g Beast, .25 JSB King Heavy
(http://i36.photobucket.com/albums/e40/Habanero69er/003_zpsa427lrzo.jpg) (http://s36.photobucket.com/user/Habanero69er/media/003_zpsa427lrzo.jpg.html)
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You're still on the fence about these? You can compare the Ultra Shock to the other pellets in the picture if you're worried about length.
OK. How long are the other pellets?
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I'm in a different time zone but later today I could give you the details. I just need to get home after work. Btw, if it is the size of your mag that bothers you, I have a AGT Vulcan and they fit the mag with no problem at all. Kalibrgun Crickets too.
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Dimensions of Beast: 10.69mm (0.4205") total length, 1.32mm inside skirt.
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Thanks, Dave.
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Here's a thread that may be helpful:
https://www.gatewaytoairguns.org/GTA/index.php?topic=107083.msg1021851#msg1021851 (https://www.gatewaytoairguns.org/GTA/index.php?topic=107083.msg1021851#msg1021851)
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Here's a thread that may be helpful:
https://www.gatewaytoairguns.org/GTA/index.php?topic=107083.msg1021851#msg1021851 (https://www.gatewaytoairguns.org/GTA/index.php?topic=107083.msg1021851#msg1021851)
Danke
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BC for the JSB Ultra Shock Heavy in .22
There isn’t much info out there. I found a couple of tests done by Airgun Shooting And Related Activities.
2017: 32FPE gun. Distance 31y
BC = 0.022BC (GA)
Source: https://www.youtube.com/watch?v=0dH0ARzPJg4 (ftp://www.youtube.com/watch?v=0dH0ARzPJg4)
2017: 35FPE gun. Distance 50y (numbers converted from metric to imperial)
BC = 0.022 (GA)
Source: https://www.youtube.com/watch?v=EfOrd1fM9ks (ftp://www.youtube.com/watch?v=EfOrd1fM9ks)
For a comprehensive list of BC numbers in .22 cal, cf.
https://www.gatewaytoairguns.org/GTA/index.php?topic=149053 (https://www.gatewaytoairguns.org/GTA/index.php?topic=149053)
Matthias
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There is a widget for calculating B.C. from point of impact under toolbox in Chairgun...
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Here's a couple of pics (thanks to ASRA's video). 8)