RE: New Bullet Design
 

Thanks. We'll keep in touch. I hope to use a lot of the guys on the forum to field test this stuff- on my dime.

RE: New Bullet Design
 

It sounds to me like the material is approx 30% heavier than a lead bullet. It will have a profile like a 150 grain bullet but weight 180 grains. The drag will match a standard 150 grain bullet.An object in motion stays in motion unless it is acted upon. Given equal drag the heavy bullet will tend to maintain its speed because it takes more drag to slow more mass. Like throwing a whiffle ball vs a baseball at the same speed.

RE: New Bullet Design
 

You lucky dog!!!! My Lilja barrel hasn't even come in yet for mine....Am getting a 9" in it........Stock's sitting here waiting to be filled up.

RE: New Bullet Design
 

Ridge I am typing this very slowly so thatyouwill hopefullyunderstand. I am using a an extreme example in an attempt get "that light" to come on. My post said that the heavier bullet, (180 grain bullet) witha 150 grain bullet profile will tend to maintain velocity better than the lighter bullet (150 grain bullet)with the same profile.

Now suppose we have two bullets with exactly the same profile and the surfaces are equally smooth but one is made of styrofoam and one is made of lead to you actually think the trajectory of the bullets and the downrange velocity will be equal?

RE: New Bullet Design
 

Ridge here is something else to chew on while you are trying to wrap your mind around the last post.

You will notice that mass/Sectional Density are part of the Ballistic Coefficient calculation. You are calling my post below "BS".

Yet according to those confusing numbers above it would seem I am dead right and you are dead wrong would it not?

RE: New Bullet Design
 

I think what you ment was a mass to frontal area to velocitity conversion yes ?

Try it like this:
a pound of lead will fall at a given rate . if it is 12x12 inches it will fall slower than if it is 2x2 inches .
the same is true given a copper ball of a given wieght and an identical lead ball that is heavierthe lead ball falls faster.

Thats why tungsten shot in lead sizes atlead velocities kills coyotes and geese at ranges about 15yds longer than lead and twice as far as steel .

RE: New Bullet Design
 

I am floored that you are not following this. There are only2 variables to consider in the formula below.A combination ofSD and i (form factor) that equals BC.

SD/i = BC

I have been as clear as possible, as hasFariswm has been in his post.that the shape of the 180 and 150 grain bullets are the same so "i" does not change. The only variable that changes in this formula is SD so it should be fairly easy for you to follow.

We will start with the 180 grain 7mm bullet itsSD is .319.

.319/.52 = .613 BCfor the 180 grain bullet.

Now it is time for the 150 grain 7mm bullet its SD is .266.

.266/.52 = .511 BC for the 150 grain bullet.

I hope the light is on, if not I give up!

When Fariswm posted the quote below he was trying to accomplish what has just been clearly spelled out to you in great detail above. He is getting a high BC, easy to stabilize bullet,while also minimizing the bullets intrusion into the cases powder volume. The benefits can mean slower twist rates which combined with the additional powder capacity could yeild higher velocities.

Here is Fariswms post.

I hope this helps you grapple with this challenging concept.;)

RE: New Bullet Design
 

Faris, I'd love to try some heavy(110 gr) 6mm bullets. I've got a 6mm-06 and it handles the long bullets like 105 gr A-maxs quite well.

RE: New Bullet Design
 

If we pull this off, and I believe we will, will theoretically could build on a 105gr profile 6mm bullet a bullet weighing more than 150 gr. That is theoretical only. I expect that 120 gr bullets on that profile should be reasonably attainable.

RE: New Bullet Design
 

I am enjoying reading the conversation that is occurring on this thread. Good open dialogue is the best way to develop solutions to problems.

But, it is important to understand that if you drop a ton of lead or an ounce of lead from the same height at the same time, both will hit the ground at the same time.

If you shoot a round horizontal to the plane of the earth at 3000 fps and drop a round at the muzzle the same time the driven round leaves the muzzle, both will hit the ground at the same time. This is gravity.

Tungsten shot kills 15 yards further for a given shot size because of sectional density of the shot. I shoot little shotgun, but assuming both lead shot and tungsten shot is fired at the same intial velocity, the tungsten based shot with its superior SD will always kill at longer ranges in proportion to the difference in the SD.