I'm just starting to dabble in Ballistics. There are many tables to find the number for the ballistic coefficient but still lacking a comprerhensive list. The manufactures include it on many slugs why not pellets also. To be honest there is a tad bit of laziness on my part. Let's encourage manufactures to print it on the label of the tin, contact your suppliers and manufactures.
Ballistic Coefficient
- Thread starter john8
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I think manufacturers might be reluctant to include BC on their labels because it is not a constant. BC for a pellet is always changing depending on a lot of factors. Altitude, temperature, humidity, air pressure, velocity etc... A pellets BC will actually change during the shot itself. From the muzzle to the target the BC will change with the velocity. It’s really an interesting and complicated science. If you are shooting at sea level or at 8000 feet will have a huge impact on your BC. I always think it’s best to use a chronograph and determine the BC of your pellets in the actual conditions where you shoot. It’s funny that I came across this post now because I did exactly that this afternoon with my HW30 in .22. I used my chronograph to calculate the BC of the JSB Exact 15.9 grain pellets in my rifle and in my conditions.
Kenny
Kenny
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John,
don't know what pellets you're trying to get a BC for.
H&N publishes the BC on their website.
You already got the link the HardAir Magazine's BC collection.
Gamo used to publish BC numbers (that really seemed inflated to me when comparing them to others).
I'll attach two Pellets BC Tables that include all the BC numbers that I have found on the various forums and from manufacturers. They are both for .22cal. (Of course, to muddy the waters, BC changes with velocity, sometimes rather significantly.)
▪The first table is for high BC pellets, at least 0.020 BC, from quality manufacturers.
▪The second table is for hollow points, from any manufacturer. (This table also gives a lot more details about the expected expansion and performance for hunting.)
At the end of the BC tables I list where the varying BC numbers come from.
Some tests use a high powered gun, some much less power, and that can influence the BC. Also, measuring the BC on a 25y stretch will produce different BCs than measuring it on a 100y stretch.
Some testers uses the GA drag model (appropriate for pellets), others the G1 model (not so appropriate). And some testers don't tell us many details about their test protocol, so it's really hard to evaluate how trustworthy their results are.....
In any case: Happy pellet shopping!
Matthias
Attachments:
View attachment PELLET BC TABLE. For .22cal. 159. 2020-11.1614572777.pdf
View attachment HP PELLET SPECS Performance Chart. 152.1614572800.pdf
don't know what pellets you're trying to get a BC for.
H&N publishes the BC on their website.
You already got the link the HardAir Magazine's BC collection.
Gamo used to publish BC numbers (that really seemed inflated to me when comparing them to others).
I'll attach two Pellets BC Tables that include all the BC numbers that I have found on the various forums and from manufacturers. They are both for .22cal. (Of course, to muddy the waters, BC changes with velocity, sometimes rather significantly.)▪The first table is for high BC pellets, at least 0.020 BC, from quality manufacturers.
▪The second table is for hollow points, from any manufacturer. (This table also gives a lot more details about the expected expansion and performance for hunting.)
At the end of the BC tables I list where the varying BC numbers come from.
Some tests use a high powered gun, some much less power, and that can influence the BC. Also, measuring the BC on a 25y stretch will produce different BCs than measuring it on a 100y stretch.Some testers uses the GA drag model (appropriate for pellets), others the G1 model (not so appropriate). And some testers don't tell us many details about their test protocol, so it's really hard to evaluate how trustworthy their results are.....
In any case: Happy pellet shopping!
Matthias
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