I was making some bullets, and my CNC machine and program allows me to make the exact same bullet, and omit a step if I so desire.

On this case the drilling of the hollow point.

I have made a run of our 158 grain bullets in two versions.

A HP 158 and a flat point at 163 grain.

I am goi g to pick three loads of suitable powders - one at the lower end, one in the middle and one close to maximum.

Already loaded Varget.

33.0 grains
37.0 grains
42.0 grains

I have selected three rifles to shoot these in.

A Sako A7
A Kimber 8400 Patrol Tactical
A Robler Titan 6

Any guess on what might the results be?

I have read that hollow points help stabilize bullets, hence nearly all centerfire rifle target bullets are hollow points. They get my vote. What is the cartridge?

Yes no and maybe.

I would vote for HP, but two of my rifles are much more accurate with Barnes tipped bullets.

I vote the HP.
It sets up a bubble of air at the tip when fired and should be more accurate. Also, strictly for 100 yard work, the flat base bullets should do microscopically better than the boat tail.

There's my vote but I've also been surprised by some of your tests.

Zeke

if it's a 308, my prediction is that you'll find 42 gr is pretty hot load

quote:

Originally posted by jeffeosso:
if it's a 308, my prediction is that you'll find 42 gr is pretty hot load

Jeff,

42.0 seems normal in all these rifles.

Results with VARGET - I will post all targets once I am done.

As mentioned above, three loads were shot in each rifle, using both bullets.

5 shot groups at 100 yards.

Loads were 33.0, 37.0 and 42.0 grains.

Primers were RWS in RWS brass.

As with all our tests, all bullets, and brass, are selected to be the same weight for each group.

Results were:

Sako A7, shot better.

Flat point
Hollow point
Flat point

Titan 6

Hollow point
Hollow point
Flat point

Kimber

Flat point
Flat point
Flat point

Next lot are with H4895

quote:

Originally posted by jeffeosso:
if it's a 308, my prediction is that you'll find 42 gr is pretty hot load

Not.

All depends on the rifle.

These ones I am using are perfectly happy with 44 grains.

Have not gone any higher.

As you can see, we cannot really draw any conclusion so far.

I am going to continue the test, with more powders and different bullet weights.

We discussed barrel heat might be affecting the results, so my shooting has been staggered.

That is I shoot a 10 shot string, alternating a flat point and a hollow point.

Each type is on a different target of course to get the groups right.

Someone here said I am splitting hairs, which is fine.

quote:

Originally posted by Saeed:

Someone here said I am splitting hairs, which is fine.

Splitting hairs is where knowledge is gained.

Very interesting experiment. Can I throw another variable into the mix? What if you change the radius of the ogive, so that there is a sharp point?

quote:

Originally posted by Peter Connan:

quote:

Originally posted by Saeed:

Someone here said I am splitting hairs, which is fine.

Splitting hairs is where knowledge is gained.

Very interesting experiment. Can I throw another variable into the mix? What if you change the radius of the ogive, so that there is a sharp point?

I think that won't work, as the drill has to have a flat point to starting drilling.

And even if I did this, it will change the shape of the bullet more from one design to the other.

Tis way, everything is exactly the same shapewise.

Except one has a hollow point and the other does not.

I have Roy and Alan here visiting, and they are shooting some of the groups.

quote:

As you can see, we cannot really draw any conclusion so far.

As long as your having fun.

quote:

Originally posted by p dog shooter:

quote:

As you can see, we cannot really draw any conclusion so far.

As long as your having fun.

Exactly my friend.

The whole point of the exercise to shoot, and may be draw some conclusions.

Had a bunch of kids a couple of days ago - from 6-12 year olds - never shot a gun before.

Their moms joined in.

I had to kick them out, they did not want to leave.

I have a trick of holding a Ruger 10/22 upside down, and shoot cans in the tunnel with it.

They thought I must be the very best shot on this earth.

Told them I have another trick.

I can make a full can of Coke explodes to pieces.

A bunch ran down the tunnel to put the can down.

Shot it with a 22 Swift!

The screaming of joy was fantastic.

Now the moms are asking when they can come back again!

Good on ya Saeed for taking the time with the kids.
Most will never forget the experience.

Zeke

I would think it would depend on the rifle in question, barrels are an inty unto themselves, a process of combined steels, a cutter and vibrations based on that. I always had wonderful results with round nose bullets, but the difference is not enough to make a decision from a hunters point of view, a good reson to use spitzers that have a better ballistic balance over all ranges.

quote:

I can make a full can of Coke explodes to pieces.

I love seeing kids faces when they shoot their first can of soda that has been well shaken up.

quote:

Originally posted by ZekeShikar:
Good on ya Saeed for taking the time with the kids.
Most will never forget the experience.

Zeke

Plus 1. Saeed, you did yourself proud (again).

quote:

Originally posted by Saeed:

quote:

Originally posted by Peter Connan:

quote:

Originally posted by Saeed:

Someone here said I am splitting hairs, which is fine.

Splitting hairs is where knowledge is gained.

Very interesting experiment. Can I throw another variable into the mix? What if you change the radius of the ogive, so that there is a sharp point?

I think that won't work, as the drill has to have a flat point to starting drilling.

And even if I did this, it will change the shape of the bullet more from one design to the other.

Tis way, everything is exactly the same shapewise.

Except one has a hollow point and the other does not.

I have Roy and Alan here visiting, and they are shooting some of the groups.

Sure, it becomes effectively a different experiment. Same length, same weight, same center of gravity (possibly), different ogive shape.

I was not envisaging drilling a hole in the sharp point, as even if you could find a way to drill it, the sharp point would effectively disappear, becoming when viewed from the side a flat point with the diameter of the flat being equal to the hole diameter.

So still splitting hairs, just more of them...