I recently purchased a Ruger American Gen II Ranch 16 inch in 22 ARC. (1:7 twist) This thing is a tack driver! After bore sighting, while zeroing, I thought I missed the paper at 100 yards with my second shot but after a closer look I one holed two shots and was .25 in off on the third. I repeated nearly same thing on the next 3 shot group. This was using Hornady ELD Match 88 Grain. Next I shot a few groups with Hornady Black ELD Match 75 grain and those did well too. The 88's had a better SD and ES. I'm going to use the once fired Hornady Brass to start working up some loads. There isn't tons of load data out there for that round yet so I'm looking for some powder suggestions. I bought some Hornady ELD-VT 62 Grain and some 75 grain ELD-M bullets for this rifle I also have a lot of other options in my inventory. I want to use a temperature stable powder that is good with heavier for caliber bullets. I plan on the replacing my 14 twist 22-250 so I can use heavier bullet. I am thinking about trying some TAC, Varget and CFE 223. (CFE isn't the best for temps but I like it)

N133, benchmark, there is some accurate powder believe it’s LT-32 should be excellent in it.

what twist is the ruger?

I would go straight to H-Varget. It's one of the best powders ever produced. I always keep a bunch of it on hand. Bolt action .223, .22-250, 7mm-08 and .308 Win, they almost always get H-Varget.

I would take a look at Leverevolution. It is near the top in velocity potential pretty much across the board where bullet weight is concerned. It performs SPLENDIDLY in the 6mm AR, which was around before the 6mm ARC but almost the same cartridge. Availability is good and one of its best attributes is the ability to dispense very accurately with an ordinary powder measure since it is a spherical powder.

Hodgdon's load data pages will give you the lowdown. Check it out.

The ppc case doesn’t have the volume for as slow as varget is, if it were a BR or BR variant I would absolutely agree with you. H380, N133 burn rates Benchmark are all the best in the PPC, 220 Russian case… which is a 22 arc.

CFE223 and Leverevolution are pretty much the velocity champs in that small case be it in 224, 6mm or 6.5mm and both are slower than Varget. there are those that use Varget but it is bulky for that little case and max loads are often crunchy when seating the heavier bullets often used in the ARC.

Hodgdon data drops out Varget in the data after I think it is 77gr or 80gr bullet weight with ARC data,

I may have been wrong on the speed scale but I know the ppc case very well and varget doesn’t work..

I have no doubt Varget does not work in the PPC case nearly as good as some other powders. It doesn't work as well in the Grendel case as many other powders. Many that have tried it say Varget is too bulky and from their experience. I did not bother to try and doubt I would try it in the ARC, there are better powders for that case.

The Grendel case is same as the ppc.. all from 220 Russian.

I worked up a few quick loads for 75gr ELD-M and 80gr ELD-X using CFE 223, Benchmark, Varget, X-terminator, TAC and N540. It was by no means a scientific approach I just loaded with powder I had on hand to eliminate the low hanging fruit. used recommended COL in new Hornady brass. (was mainly wanting to fire the new brass) I only loaded 3-5 of each just to see what the velocity was going to look like. They really all shot good. I don't think Varget and Benchmark are going to be as good as far as velocity with the heavier bullets but that's only based on my Garmin after a few rounds. Apparently this rifle isn't going to be too picky about powders! Right now I think N540, CFE223 and TAC are the leaders in the clubhouse. As I said this was mainly done to get once fired brass not proper load development but I don't think this one is going to be difficult to find a good load for.

1:7

I just put a 22 ARC together with a 16 inch Faxon barrel. Not picky at all, shoots better than expected. 80 gr. ELDM on top of SMP763 work great. Really liking it.