Round Nose Ammo vs Pointed...

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11 years 9 months ago #17983 by Sharkey
Round Nose Ammo vs Pointed... was created by Sharkey
I've always heard about the round nose ammo being less apt to deflect when shooting through brush and other light obstructions as compared to pointed ammo but wondering if anyone has the REAL facts on this...

I've always liked using them just because they seem a bit more "traumatic" than pointed rounds but I've never really known for sure about the "deflection" properties.

Anyone have the goods on this?

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11 years 9 months ago #17984 by jtallen83
Replied by jtallen83 on topic Round Nose Ammo vs Pointed...
Here is a good explanation of the "brush buster" myth.
www.cabelas.com/product/Outdoor-Info/Art...ster-Myth/532941.uts

I find the exposed lead on a round nose gets tore up in my AR-10. They always function but you can see they take a beating finding their way home.

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11 years 9 months ago #17988 by OleCowboy
Replied by OleCowboy on topic Round Nose Ammo vs Pointed...
Now you are talking ballistics or in this case "aerodynamics' a science unto itself. Friend of mine is a Aerodynamics engineer. So I wanted his take. I will put it simple and short: Take all the factors that apply (length, diameter, spin, velocity, etc etc etc etc etc) all the rules apply, none of the rules apply, some of the rules apply.

Then he pointed out to me the nose on a rocket, well it ain't pointed, ever wonder why.

Which leads us to the Porsche study: Only recently no one really knew the most efficient shape. So Porsche did a LOT of research, and the ANSWER WAS?????







EGG

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11 years 9 months ago #17991 by jtallen83
Replied by jtallen83 on topic Round Nose Ammo vs Pointed...

OleCowboy wrote: Then he pointed out to me the nose on a rocket, well it ain't pointed, ever wonder why.
EGG




Rockets are long and skinny though, not short and fat. The point might be a factor but the length should be a bigger factor in deflection, longer wheelbase, steadier ride over the bumps.

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11 years 9 months ago #17992 by 13fcolt
Replied by 13fcolt on topic Round Nose Ammo vs Pointed...
Round deflect more, Pointy deflects less.
When talking about barrier penetration, be it dense brush or car windshield or whatever it's no longer in the realm of aerodynamics. You whittle a stick with a sharp edge at an angle because a rounded edge would deflect. Granted, with enough force the rounded edge can be forced to cut, and there are angles where the sharp edge wont work, but in the end if you need to get through something, pointy is what works for that.

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11 years 9 months ago #17994 by VTIT
Replied by VTIT on topic Round Nose Ammo vs Pointed...
Sorry been working on a ballistic program so:

If we are talking pure flight through air then it's all about BC (Ballistic Coefficient). Which is figured as

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where:
BCPhysics = ballistic coefficient as used in physics and engineering
M = mass
Cd = drag coefficient
A = cross-sectional area
ρ (rho) = average density
l = body length

Using this we can assume that the projectiles with a pointed nose would have better BC because they would have a lower drag coefficient (Cd) and longer body (l) for a given density and mass.

All this is useful, sort of, if we are talking penetration through an object. For maximum penetration you would want to apply the maximum force on the smallest area (pointed wins again). The problem is if the bullet expands on penetration. A FMJ bullet would have better penetration VS a hollow or soft point bullet. Throw in a bullet with a steel or even titanium core and the penetration is even higher. Adding tungsten to the body of the bullet would give it a higher mass and penetration would improve up to a given distance, then there is a diminishing return.

But does all this really matter looking at lethality? I mean there is a reason they use flat bullets when hunting dangerous game. A flat round bullet would cause a bigger wound cavity. The problem is they fall on the ground at any distance and lose the punch needed to penetrate. Look at the BC for a .44 Magnum and you will know what I mean.

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11 years 9 months ago #18010 by OleCowboy
Replied by OleCowboy on topic Round Nose Ammo vs Pointed...
Bottom line there is no bottom line. ALL factors must be inputed into the equation, then in the case of a bullet, is it meant for armor piercing, or ??????

So I asked my buddy about the nose cone on rockets, some are round some are pointed. Simply put, long body, ultra high velocity has a rounded nose cone and just high speed short body missiles use a pointed nose cone, but then that said you are seeing the results of extensive testing, post development.

I would say and hope that what ever they are selling has had extensive R&D prior to putting it on a casing...

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