In some of the larger cases and with most powders I have found, at least so far, the groups are better using dacron.
I use enough to fill the air space between the powder and bullet and really like the bullet to compress the dacron.
Wondering how some others are using dacron.
Currently in my 45/90 and IMR 4198 and 3031 I am using 2 grains, cut in about 1/2 X 1/2 X 1/2 cubes.
Drew