why a target bullet is jacketed HP ?

Hornady 6.5/140 BTHP Match :

As opposed to what?

Balance?

bullet is jacketed , so has no impact on precision.

FMJ?

Balance.

A weight rear bias is more stable.
If there is the slightest wobble, forward weight enhances it.
Rear helps to attenuate it.

Weight toward the rear has different flight characteristics than weight distributed elsewise, particularly when traveling through trans-sonic zone.

No weight in the nose

a solid bullet would perform better.

https://lasvegasshootingcenter.com/2018/10/03/ammunition-what-you-need-to-know-when-target-shooting/

Maybe not. My cousin was a bench rest shooter and HP is what they shot. I figured they knew. On a side note I mistakenly shot a big boar hog with a Hornady BTHP 178gr. in my .30-06. I had intended to load with 180 Speer Hot-Cor but had the HPBT instead. He went down like a sack of rocks. When I shoot water jugs with them there is no evidence of expansion. The same result was noted with 155 Scenar. I saw a deer that Dirt Farmer shot with a Scenar out of a .240 Weatherby and the damage was ugly to see. Guessing the bullet speed is a factor. My bullets go about 2750, his probably 3400+. But in any case the HP must be more accurate than FMJ.

Show me the benchrest records to prove this.

That’s why all the “target” bullets are solids?

They(LVSC) are discussing plinking, practice & blasting ammo vs. self defense. Just because it's sometimes shot a targets doesn't make it target ammo. Their nomenclature is wrong.

Their misleading & incomplete explanation of things should be disregarded.

I can't , i am convinced experts at hornady know what they are doing , just wanted to get a second opinion from 24CF members.

It was my understanding the hole was for a rod to insert into hole to push bullet out of mold so as not to deform the nose.

Because if you use a FMJ, the base is open. Open bases are notoriously inconsistent and that degrades accuracy. Even Lapua discontinued their FMJ match bullets.

They are HP because everyone wants the utmost in length consistency for seating at the most accurate OAL. Soft points have inconsistent lengths and the tips are easily damaged.

Yes, the empty space/balance in the jacket has an effect on accuracy, however small, with Berger introducing their "column target bullets" that is supposed to have that empty space optimized.

Ultra-long-range match bullets for the big boomers are made of lathed mono-metal. It doesn't matter to me, but I am guessing that mono-metal target bullets can be lathed in a way that allows them to travel down the bore with less resistance and less deformation, thus producing more consistent BC over the flight of the bullet. I don't think this matters for bench rest, but it likely does at a mile and beyond.

Do they still machine driving bands into them? That feature is nearly impossible to make on a conventional jacketed bullet.

Monos also solve the problem of bullet blowup from driving long, high BC bullets fast.

Tyrone mentions the reason in hi first paragraph.
The way bullets are made is that a ram pushes on a copper plate to make a cup that is then filled with lead. You can make the open end of the cup, the bullet jacket, either at the front or the back of the bullet. The most important part of a bullet as far as stability is concerned is the last little bit that touches the rifling as it exits the muzzle, that is, the base of the bullet. In order for that to be the most uniform and consistent, manufacturers fill the lead in from the other end - the hollow point.
At least that's the way the US Army Marksmanship Unit explained it to me.

I can't recall not seeing one of them without the driving band, gas seal, or whatever they want to call it. And I agree that jacketed bullets would not work with such, as they "slug up" when fired.

Have you been able to do any sling matches this year?