6arc bolt gun

[SKWERLZ]

It's fine to disagree. Here's a pic of the difference. That's literally it!. The only difference is that ppc shoulder is .045 forward on the ARC. Otherwise, they are identical.

So closer to 22 arc length

 

[gunsandgunsmithing]

So closer to 22 arc length

Yes, barely. The 22 ARC is exactly a 22 Grendel and the shoulder is an additional .030 forward, so .075 longer than a PPC. Different prints may show it as .070 but you get the idea. The 6 Arc is in between a ppc and 22 ARC(Grendel). So yes, you are correct that a 22 ARC is longer than a 6 ARC

I've been pretty fortunate competing in sr br with a 6 Grendel for several years now. I can load it just like a ppc but can get slightly better speeds if I step on it a bit. I can't say that one is better than the other. They both flat shoot. Started shooting a 22 ARC last season but haven't had time to get to know it well yet. It's bad fast though, in a bolt gun. With the right powder, pretty sure I can get 55's to 3900fps. I've seen 3830fps so far and it shoots but hard on brass with n133 at that speed. I'll play with it more soon. That's not book data, so work up with caution and certainly not in a gas gun.

 

[Oso]

The 6ARC is shorter than the 6.5 Grendel. To sidestep the established 6mmAR (aka 6mm Grendel), Hornady barely tweaked the case geometry so that it could rename … I mean name its newly created proprietary cartridge. With the 6ARC being shorter it eliminates the potential risk of loading a 6.5 Grendel into its chamber and closing the bolt. Lesson learned from 300BO fitting inside chamber for .223/5.56 and blowing up barrels.

Unlike the 6mmAR, there really hasn’t been an established .22 Grendel in the market. Hornady simply necked down a 6.5 Grendel and named it 22ARC. This is why 22ARC is longer case than 6ARC.