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Is the Ballistic Coefficient Accurate?

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SecondsCount said:
How does your 146 grain 30 cal bullet compare in performance to a traditional boat tail bullet?

Am I reading your graph correctly is post#3 that shows the BC of a bullet eventually starting to decrease the faster it flies?
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My 30 Cal bullets are only stable with a 1:8 twist so I'm shooting them from a 300 Blackout with really great results. They are marginally stable from a .308 Win and the wobble shows up as group spreading.

Both bullets leave the barrel at the same muzzle velocity (depending upon the powder load) but my bullets have such lower drag that they bleed off the energy much slower. I'm getting about 40% greater range based upon impact energy over a traditional BT of the same weight. Or increased impact energy at the same range.
 
HappyHellfire said:
Hi Dave,

One of the reasons that the "nerdy academic" side of ballistics is held in so little regard is that it is so difficult to translate the math into a solid initial drop table. I would like to see that change. When a pointy boattail is advertised as a G1 BC and then a shooter plugs that into a ballistic solver and gets garbage results, it implies that the math is wrong.

And yes, my bullets do not follow any of the standard profiles like the G1 or G7. I need to get y'all to start thinking about that and swallow the pill that these new bullets are the next step in rifle shooting.

Maybe I should put a drop table calculator on my website? One that uses drag curves instead of BC?
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Maybe compare the drop and wind drift of your bullet up against a known LR bullet (ie 7mm 180g Berger LR Hybrid). That would get some folks to take notice. Personally, I love math. I’m a double major (Mech Eng and Math) and getting my kids interested in math has been harder than getting them to eat all their veggies, including the gross ones like cauliflower and broccoli. Some people love math and others find it more repulsive than the idea of a male Olympic champion parading around as a female (just a hypothetical here). lol
Dave
 
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280ai said:
What is needed here is a verified side by side test. Your new bullet design against say three of the top bullets same Cal. and weight shot at 500 out of the same gun. Target always tells the truth!
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^^^^^^^^ THIS. EXACTLY. PRECISELY. This is required to make folks stand up and take notice.
Dave
 
HappyHellfire said:
My 30 Cal bullets are only stable with a 1:8 twist so I'm shooting them from a 300 Blackout with really great results. They are marginally stable from a .308 Win and the wobble shows up as group spreading.

Both bullets leave the barrel at the same muzzle velocity (depending upon the powder load) but my bullets have such lower drag that they bleed off the energy much slower. I'm getting about 40% greater range based upon impact energy over a traditional BT of the same weight. Or increased impact energy at the same range.
Click to expand...
Care to show your magic bullet??? Shape?
 
HappyHellfire said:
My 30 Cal bullets are only stable with a 1:8 twist so I'm shooting them from a 300 Blackout with really great results. They are marginally stable from a .308 Win and the wobble shows up as group spreading.

Both bullets leave the barrel at the same muzzle velocity (depending upon the powder load) but my bullets have such lower drag that they bleed off the energy much slower. I'm getting about 40% greater range based upon impact energy over a traditional BT of the same weight. Or increased impact energy at the same range.
Click to expand...
Wait a minute, your bullet is stable in a 300 blackout but not in a 308? Why is this? Bullet stability has zero to do with case except for volume to ensure you can launch it fast enough. You are comparing apples to oranges here

Also, you will still need the g1 or g7 bc of your bullets because that is what the current ballistics calculators use, like it or not
 
HappyHellfire said:
View attachment 1565137
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Happy Hellire,
You, as a certified scientist and doctorate, should know this target doesn’t mean sh*t without some frame of reference. What bullet? Mv? Distance shot at? Conditions?
This target is laughable if shot at 100 or 200 yards, I would not be please with this target at those distances at all. But reference and a legend are key here. You wouldn’t include a picture or graph in your doctoral thesis without references, notes, legend, and true measured data. No offense intended (which clearly means I’m about to offend you) but, you are definitely losing credibility with this thread and how you are approaching the audience here. Perhaps we can rewind the clock and start over with a different approach.
Good luck sir,
Dave
 
HappyHellfire said:
My 30 Cal bullets are only stable with a 1:8 twist so I'm shooting them from a 300 Blackout with really great results. They are marginally stable from a .308 Win and the wobble shows up as group spreading.

Both bullets leave the barrel at the same muzzle velocity (depending upon the powder load) but my bullets have such lower drag that they bleed off the energy much slower. I'm getting about 40% greater range based upon impact energy over a traditional BT of the same weight. Or increased impact energy at the same range.
Click to expand...
The first sentence tells that your “magic bullet” is not a solution to a problem but a problem needing a solution. The vast majority of 30 caliber barrels out in the world are 10 twist at fastest. Sure, custom barrels are available but it certainly limits the market for your product.
 
Dave M. said:
Is this the design Hellfire is talking about??? Why is he being so cryptic in not posting the info himself??
Dave
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Yes, he linked (kinda sorta) his website in his original post. I think he's being at least slightly subtle so he's not seen as blatantly advertising his product.

I myself don't mind his posting the bullets and info. Nice to see different ideas come around.

General 1 — Aerospike Bullets

www.aerospikebullets.com www.aerospikebullets.com
 
shoot4fun said:
The first sentence tells that your “magic bullet” is not a solution to a problem but a problem needing a solution. The vast majority of 30 caliber barrels out in the world are 10 twist at fastest. Sure, custom barrels are available but it certainly limits the market for your product.
Click to expand...
Yep, that's why I focused on the 6.5 Creedmoor for long distance. I'd really like to see what some of y'all can do with that design.
 
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