Quickload has a 100% load density of Varget being 101% with 4166, using the exact same charge weight. It holds true in the 223 too
I’ll have to pass on the 4166. With Varget I’m already having to re-seat my bullets after a couple of days of sitting on the bench. Some of the bullets work their way out as much as .008” due to the highly compressed load. I use a 8” drop tube and a vibrator on the side of the case when I charge them, switching to a more dense powder might be better just for ease of loading.
I can understand now why you want a exact substitute for Varget, one that features all the great benefits you have mentioned here.
I should add, it’s already a heavily compressed load, so the substitute will have to be the same or slightly less bulky.
they need to make a Varget short cut version!