rws-ammunition.com/en/infotainment/rws-bullets/rws-doppelkern-twin-core

There is nothing new about the partition bullet but this is one of its finest iterations from one of the best bullet makers in the world. This is far from their latest all singing all dancing bullet (it has two younger brothers that I may post too which outdo it in certain respects) but its a heck of a fine bullet. I have killed about 150 deer with this bullet. I have used other bullets and will use others but this is a great workhorse bullet that I highly recommend if you can be bothered to go to the great trouble of ordering it. (They don't seem in a hurry to sell them outside the EU). Germans generally favour factory ammunition (they seem to be a people who do not like tinkering little men in sheds) and their factory cartridges are very fine indeed but load this bullet for yourself and you can get half a minute of accuracy, hydrostatic kills half the time and and a sweet low recoil shot.

The ultimate bullet would be an impossible combination of traits but this one ticks a lot of them. You don't need vast energy transfer as much as totally reliable big energy transfer at vital organ depth -not earlier and not later. Many cartridge makers and home loaders fail to appreciate this fact. The bullet has to perform well at the speed your rifle flings it (not the speed a test barrel does) and still work OK whether it hits a shoulder blade or enters behind the ribs, whether it hits at 20 yards or 200. The perfect bullet does not exist but this is a very tolerant one at normal hunting ranges.

They didn't re-invent the wheel here, they just got the hardness of the cores and the thickness of the jacket perfect. This will in a stretch do anything up to a moose and down to a varmint with the nose cone only breaking up after it has passed through the ribs. After you have expended energy at a sensible depth, you want a core that reliably punches through any bones to exit and depressurise the chest cavity in case you have not killed outright, so that a failure to breathe will not let your target live long. This will also give you a better blood trail. A bullet that cuts hair so you can easily find the beginning of a faint blood trail is a further asset.

Whatever you do when you select a bullet, select for tolerance and reliable performance above massive energy transfer. Your ideal bullet will probably not actually win at any one stat but it will do it all pretty good. In a world where a "top trumps" mentality makes bullet makers want to have a massive stat to sell a bullet, this can lead people to avoid the steady reliable bullets that kill and kill time and time again without huge meat damage.