I've been watching the Hornady podcasts pretty much since the beginning. First and foremost Hornady makes bullets. They also make ammunition but they do so to sell their bullets to those people that do not reload. They do have special powders made for them too.
Most all that work there are shooters. They compete and hunt. They have the passion.
The bottom line is that they are changing how the world sees cartridges and bullets - in real time. They've figured it out. Their thinking goes like this:
In making a better bullet they figured out that a long (for caliber) very aerodynamic bullet retains more velocity and energy for a given muzzle velocity. Dramatically so. This was a paradigm shift. They could run one of these bullets at a MV of 2750 that at 600 or so yards would fly right by a less efficient bullet of the same caliber shot with a 3000 MV. More barrel life, less recoil and MORE accuracy. Plus, they cleaned clock bucking wind.
So, they created the better bullet but had no cartridges they could fit them in. The problem was the they could not fit those bullets into existing cartridges of older design because they are so long that they don't fit in older chambers and magazines. That's were the new cartridges started.
Enter the Hornady .204 Ruger, then quickly followed by the 6.5 Creedmoor. The rest is history. Every new cartridge they develop now is based on this design philosophy, which is the only way to get those long bullets into Remington short actions, AR, etc. So, they went to SAMMI and said: here's our new cartridge. And that REALLY changed everything because SAMMI accepted their tolerances for chambers that are tighter than the old stuff as well (spelled accuracy).
There is much more to it than that but you get the picture. Hornady is leading the pack when it comes to bullets, and consequently cartridge specs.
The 22 ARC cartridge is NOT a neck downed 6mm ARC. It's different (slightly longer - slightly shorter bullets). That tells you how far they go on the details.
Talking about the 6 ARC, they also have new VT/Match bullets out right now - a new 6mm ARC 80 grain VT bullet. And it's a screamer! And almost the same length as the 108 match! They figured it out and went out and did it. This picture below shows how they did it. It took a LOT of work (over 2-years) to get the manufacturing and the balance right between the CG and the center of pressure. Look at how short the lead is compared to the brass. More than a third of the bullet is empty space! These rounds explode on contact - devastating on varmints.
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For those of you that compete in PRS, the Hornady boys have been secretly loading magazines, mixing different bullet weights like this 80 grain (they were secretly testing it in real life) and the 108 grain bullets in the
same magazine for stages that had short and long targets.
Now that this is out watch everyone else follow through!