Sure, under flat based I get it. But my big conical .58 bullet has a huge thin walled domed cavity on the bottom, with a distinct driving band on the skirt base, which flares out when fired, sealing the bore. It can’t hurt to put a 5/8” día felt wad underneath it I guess, but in this particular instance I don’t think it’s as necessary. I’ve been shooting it without a wad, but will try it with one and see if it helps accuracy.I use oversized 1/8'' wool wads under all my flat base, full bore conicals/bullets. I have never checked the difference of not using a wool wad with the chronograph, but for bullet grouping size it makes a big difference.
In my black powder sidelocks and in-lines I will use the lubed wads for target practice. For hunting I use the dry wads for fear of contaminating any of the powder.
Dry wool wads make a big accuracy difference in my smokeless muzzleloader as well.
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