I'll second the comments about Varget being slow for 40-55 but peachy for heavier bullets, but with a caveat.
If you have a longer throat, and can seat your 55s out a ways, Varget will work well. However, when I went to a shorter-throated new barrel, I had "packing" issues and the only way I got good groups was by using Mic McPherson's "swirl charge" technique, which is not an option when you are pooping out a couple hundred rounds at a crack. I just prefer pumping and dumping.
So...I use H 4895 instead for 50s and 55s, and Varget for 60 and up in a bolter 223.