Heck use what you want, but you really should read what Harris "actually" wrote along with the context of why he wrote it.
Harris was looking at using redot powder in rifles. Why reddot powder???? It was an extremely common powder for shotguns, it was cheap & it didn't use a lot of powder per load (that's the cheap thing again).
Harris wrote:
I had a caddy of Red Dot, and no longer reloaded shotshells, so asked myself, "what can I do with it?
Harris was looking for
cheap practice loads for the high powers to practice offhand with. So he did a little digging and found data using reddot in 30-06 cases. Harris's words not mine:
No. 1 and the Lyman Cast Bullet Handbook suggested it would, so I tried it, much to my delight!
Red Dot is bulky, compared to the usual rifle powders used in .30-'06-size cases. It occupies more powder space in typical charges than common "reduced load" rifle powders, such as #2400,
IMR4227, IMR4198 or RL-7.
So Harris came up with
"THE LOAD" using 13gr of reddot and when using "THE LOAD" (reddot powder in rifle cases) these were his basic rules.
1. The case must be LARGER than the .300 Savage or .35 Remington.
2. The rifle must be of MODERN (post 189
design, suitable for smokeless powder, with a bore size of .30 cal. or larger.
3. The bullet weight must be within the NORMAL range for the given cartridge.
4.
Inert fillers such as Dacron, kapok or are NOT RECOMMENDED! (Nor are they necessary).
What you guys get:
Harris says don't use fillers!!!
What I get:
Harris was writing about using a fast burning, bulky pistol powder and liked using it over powders like 4227 because it uses more case volume and doesn't need a filler.
Like I said, use what you want but you really shouldn't base your thinking on misinformation.
Harris never said not to use fillers with any of the common rifle powders. He did say
you don't need to use fillers with reddot. Harris also said he
liked reddot better than the reduced loads of rifle powders like 4227.