HAM Publishes Most Comprehensive Database of Airgun Pellet Ballistic Coefficient
- Thread starter mmahoney
- Start date
Ballistic Coefficients[/QUOTE]http://hardairmagazine.com/ballistic-coefficients/embed/
all i can see is that the slower the velocity, the better the BC. It seems you are pushing them most too fast from that Impact
all i can see is that the slower the velocity, the better the BC. It seems you are pushing them most too fast from that Impact
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not sure at what muzzle velocities are these made at but this is a longer list and different source. Not ST barrel of course.
http://www.photosbykev.com/wordpress/userfiles/pelletdata.htm
plus here is another one, may be out of date/old but with loads of additional/surrounding info.
https://www.gatewaytoairguns.org/GTA/index.php?topic=14735.0
with that much adjustability in the Impact they should have made you a chart
BC versus speed for the fewl JSB variants what exist.
very interested in finding out how the muzzle velocity optimizes for the skirted pellets,
who can test the X barrel?
http://www.photosbykev.com/wordpress/userfiles/pelletdata.htm
plus here is another one, may be out of date/old but with loads of additional/surrounding info.
https://www.gatewaytoairguns.org/GTA/index.php?topic=14735.0
with that much adjustability in the Impact they should have made you a chart
BC versus speed for the fewl JSB variants what exist.
very interested in finding out how the muzzle velocity optimizes for the skirted pellets,
who can test the X barrel?
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Sometimes things baffle me. Case in point, the HAM selection for the JSB .30 cal. BC. They decided (?) to use the 50.15 gr, instead of the much more popular 44.75 gr. Things that make you go hmmm. 
So, perhaps they could evaluate the JSB .30 cal. 44.75 gr pellet? Additionally, many of the heavier pellets were evaluated at a lower muzzle velocity that most of us do not use. Look at the .25 cal. JSB pellets and the previously mentioned .30 cal. JSB pellet.
So, perhaps they could evaluate the JSB .30 cal. 44.75 gr pellet? Additionally, many of the heavier pellets were evaluated at a lower muzzle velocity that most of us do not use. Look at the .25 cal. JSB pellets and the previously mentioned .30 cal. JSB pellet.Upvote 0
Firstly, I'm glad that this BC database is of interest. I hope it will also be of help to many airgun shooters!
Ballistic Coefficients[/QUOTE]http://hardairmagazine.com/ballistic-coefficients/embed/
So far, we have tested 81 pellets. We expect to add another 20+ to this within the next couple of months. That should take us to over 100 comparable Ballistic Coefficients that have all been generated in a structured, controlled and repeatable test methodology. So far as I am aware, this is the largest independent database of airgun BCs that has ever been produced.
The pellets included in the database so far come from two main sources:
1. Pellets HAM Tester Doug Wall and I happened to have in stock ourselves.
2. Pellets that have been sent to us by manufacturers. In particular, both Predator International - the US distributors of JSB pellets - and H&N have seen the value of our work and have sent us many pellets to test. Where there's pellets by JSB that are not in the database, it means that Predator International has not sent them to us. We still have more H&N pellets to be tested.
Obviously our aim is to generate BCs for as many pellets as possible. My guess is that we will never test every single pellet, but we'll try to cover the vast majority of those that are of interest to the majority of shooters.
And there’s the first of several background stories about the HAM BC testing here:
HAM Publishes Most Comprehensive Database of Airgun Pellet Ballistic Coefficients[/QUOTE]http://hardairmagazine.com/news/ham...f-airgun-pellet-ballistic-coefficients/embed/
Stephen Archer
Hard Air Magazine
http://www.hardairmagazine.com
Ballistic Coefficients[/QUOTE]
So far, we have tested 81 pellets. We expect to add another 20+ to this within the next couple of months. That should take us to over 100 comparable Ballistic Coefficients that have all been generated in a structured, controlled and repeatable test methodology. So far as I am aware, this is the largest independent database of airgun BCs that has ever been produced.
The pellets included in the database so far come from two main sources:
1. Pellets HAM Tester Doug Wall and I happened to have in stock ourselves.
2. Pellets that have been sent to us by manufacturers. In particular, both Predator International - the US distributors of JSB pellets - and H&N have seen the value of our work and have sent us many pellets to test. Where there's pellets by JSB that are not in the database, it means that Predator International has not sent them to us. We still have more H&N pellets to be tested.
Obviously our aim is to generate BCs for as many pellets as possible. My guess is that we will never test every single pellet, but we'll try to cover the vast majority of those that are of interest to the majority of shooters.
And there’s the first of several background stories about the HAM BC testing here:
HAM Publishes Most Comprehensive Database of Airgun Pellet Ballistic Coefficients[/QUOTE]
Stephen Archer
Hard Air Magazine
http://www.hardairmagazine.com
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Thanks HAM. Please don't take this the wrong way, we appreciate the effort. However, for the database to be useful, I'm sure most of us would be more interested in the tests being done at "normal" velocities for the pellets you test. Case in point, the .30 cal JSB 50.15 gr. Most shooters use these at between 820 and 860 fps, but your test was way less than that. Also, for the .25 cal JSB Exact and Exact Heavy (25 and 34gr), you tested not at the "normal" most accurate velocities used (885 to 935 for 25 gr and 820 to 860 for 34 gr) but at much lower velocities. As you well know, the BC changes with velocity, so for the numbers to be useful and to validate your effort, I recommend testing be done at common velocities used by the majority of shooters using the .25 and .30 pellets. I think with the .22 you were close, and I can't comment on .177 since I don't shoot that caliber. Thanks again!!!
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I wanted to respond to Centercut's comment on why HAM tested the 50.15 grain .30 caliber JSB's versus the more popular 44.75 grain version. Simple reason, we were out of stock when I sent the samples to Stephen for the BC testing! Glad you caught this Centercut! Had I had both in stock at that time, we would have had data on both. Our bad, but it has been a struggle getting containers in to the US from the factory in the CZ. Hurricanes wrecked havoc on container ships coming into the US through the Port of Houston. In addition sales of JSB has maxed production out and staying up with demand has been a huge problem. We hope that this problem is solved in the near future.
I have sent Stephen at HAM the 44.75 grain .30 calibers for his testing. He told me that latter this month, he would be able to test these particular pellets.
Thank you Centercut for bringing this up. It is appreciated.
Dick Dixon
Predator International, Inc.
I have sent Stephen at HAM the 44.75 grain .30 calibers for his testing. He told me that latter this month, he would be able to test these particular pellets.
Thank you Centercut for bringing this up. It is appreciated.
Dick Dixon
Predator International, Inc.
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