Would you please print the BC of your products on the container. How hard is that. At least give a guy a starting point.
To all pellet and slug manufacturers!!!!!!!!!!
- Thread starter shambozzie
- Start date
Problem with doing that is the BC will be different depending on what barrel and velocity combo you are using.
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Numerous data bases with Bc but it could a starting point. I see frequent request for BC's on forum. Would be real nice for guys starting out.
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G
Guest
Guest
Its not fixed, Bc of a JSB from M rod and P rod will be different. It's something that is gun specific.
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Yeah, and even then it can change depending on velocities and environmental conditions! Case in point, the variation of these 47gr NSA HP .300's out of my R5 long at 947fps in 75F in >30.00hg was 0.078, and yesterday in 48F 29.89hg it was 0.068 at 903fps. Winds were about the same, used velocity averages at 50y and 100y from LabRadar.
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Guys, great info on BC , but the key phrase in my op was "Starting point". Can't see where it would hurt.
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I hit send before I finished writing.. I was going to say that I agree, there should be some references given of some kind. Case in point - had I have known that the BC of the 47gr, I would not have got into this .30 cal nor all of the ammo that i got for it..
I was lead to believe they would have been closer to 0.09 - 0.12, not the case. Any sort of base reference point would have enabled me to make a more educated purchasing decision.
I was lead to believe they would have been closer to 0.09 - 0.12, not the case. Any sort of base reference point would have enabled me to make a more educated purchasing decision.
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Guys, great info on BC , but the key phrase in my op was "Starting point". Can't see where it would hurt.
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There is a BC data base on this sight. When I don't know I go to it and it is reasonable close by picking a like pellet.
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I'm I wrong in thinking that while the exact BC would change from situation to situation the information he's asking for would be a way to compare one bullet, slug or pellet to OTHERS. Slugs for air rifles are short and fat just from looking at them it would appear to me that the BC is not going to be great. Again am I wrong?
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At least give OAL & head diameter to thousandths. Length tells me if engaged in rifling or fits in mag. Plus calculators can get you close to BC if all info available.
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ha.... no one has been able to produce a tin full of pellets that measure within more than a few hundredths sometimes tenths...… thousandths....
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G
Guest
Guest
Great idea. How long before the first lawsuit for false advertising because the bc on the box doesn't match the one calculated for that particular gun?
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For the starting point you were asking for: 
A year ago I searched high and low for BC numbers, in published sources and on forums. I gathered them all and combined them into one big table.
Sorry, only .22 cal done comprehensively (I do have a collection of .177 and .25 BCs, just not nicely finished yet). And only pellets with a BC of at least 0.020 made it into the table (and any kind of hollow point regardless of BC). Other pellets just don't interest me, as I have a windy ocean on one side where I live, and mountain winds on the other....
Link is here: https://www.airgunnation.com/topic/bc-table-22cal-comprehensive-internet-wide-collection-of-ballistic-coeff-data/
Matthias
A year ago I searched high and low for BC numbers, in published sources and on forums. I gathered them all and combined them into one big table.
Sorry, only .22 cal done comprehensively (I do have a collection of .177 and .25 BCs, just not nicely finished yet). And only pellets with a BC of at least 0.020 made it into the table (and any kind of hollow point regardless of BC). Other pellets just don't interest me, as I have a windy ocean on one side where I live, and mountain winds on the other....
Link is here: https://www.airgunnation.com/topic/bc-table-22cal-comprehensive-internet-wide-collection-of-ballistic-coeff-data/
Matthias
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If you check out Strelok Pro (not sure on the cheaper versions) they now have a pellet database with a bunch of pellets and even NSA slugs.
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Agree.......AoA has a "starting point" on their site.
Hopefully H&N and JSB will have something when they come out with theirs.
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If I remember right,HardAirMagazine.com? has some charts with bc and fpe for alot of pellets.17 & 22 maybe 25.I was interested only in the 22cal. The JSB 18.13 were ranked near the top along with Soverein and AirArms. It looked like it get,s updated when new pellets come out.
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The data from HardAir Magazine I have incorporated into the BC table mentioned in my previous post. They did a great job of gathering this data.
Also included are BCs from other sources, using sometimes a higher, sometimes a lower muzzle energy than the HardAir test. It is important to consider what BCs others have found — as there are sometimes quite large differences....
H&N has published the BCs for all of their pellets on their webpage.
I think the future of the ballistic coefficient lies in measuring BC at different velocities and using a variable BC rather than a static BC.
Strelok Pro allows us to enter 5 different BC values for 5 different speeds, and Srelok Pro and ChairGun (for Windows) allows to enter an even more detailed drag coefficient function.
In the near future I'd like to try and create a drag function specifically for the PCP I'm getting, once I figure out its favoite pellets.
Also included are BCs from other sources, using sometimes a higher, sometimes a lower muzzle energy than the HardAir test. It is important to consider what BCs others have found — as there are sometimes quite large differences....
H&N has published the BCs for all of their pellets on their webpage.
I think the future of the ballistic coefficient lies in measuring BC at different velocities and using a variable BC rather than a static BC.
Strelok Pro allows us to enter 5 different BC values for 5 different speeds, and Srelok Pro and ChairGun (for Windows) allows to enter an even more detailed drag coefficient function.
In the near future I'd like to try and create a drag function specifically for the PCP I'm getting, once I figure out its favoite pellets.
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A good place to start with slugs is .08
I use Strelok Pro and there is a trajectory validation feature that will calculate the BC for me based upon actual drop.
It's very accurate.
I use Strelok Pro and there is a trajectory validation feature that will calculate the BC for me based upon actual drop.
It's very accurate.
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