I am a big fan of Varget. However, I have not used it in the .223---in fact, I have only loaded 50 rounds of .223....ever. And haven't even shot those! Interesting to hear about Varget in that cartridge though. I'll have to keep that in mind when I finally get through what's been loaded.

Edited to add: My .223

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People shooting highpower competition like Varget and Reloader 15, and sometimes even WW748. This is typically with bullets from 69 grains to 80 grains in 20" and longer barrels. I have had very good luck with Reloader 15 and 52 grain bullets, I think Varget would still work for that. 60-65 grain bullets should be fine with either powder. Whether these will be more accurate than H335 will require testing in your rifle.

There are a lot of powders that will work in a carbine length barrel. In a 20" barrel you can find powders that are marginally too fast to give proper pressure at the gas port. I found that H332 can be very accurate with 52 grain bullets but may not reliably function a 20" barrel gun. The powders listed above are used a lot because they work well so no reason to change, but there might be another 5 or 10 powders that could be interchangeable with medium weight bullets.

When Varget became popular, I tested it against my tried and true H335 loads with standard bullets, no heavy weights. I found no difference in my shooting from two AR'S and a Mini-14. I look for accuracy, not velocity. H335 is a lot easier to load with too. YMMV