What would be nice is the same chart for punches for making felt wads.
I've made this recommendation before and it seemed to fall flat. Below is a copy/paste of a post on a different muzzleloader forum that describes this.
Thought i would share this for those looking to make their own over powder wads at home. I will go with these 5 calibers .36, .45, .50, .54, and .58 Cal
In an over powder wad we are usually looking for a bit oversize to seal the bore good, say 10-15 thou over bore, depending on bore and Groove, but 10-15 thou over is a safe bet for a good gas seal. I have found that MM Hollow punches are a better fit in some cases than Inch. I have, and use both. Here are examples of sizes that i feel to be ideal.
For .36 Cal a 3/8 dia Hollow punch is the best fit at .375 There are no MM sizes close enough here.
For .45 Caliber rifle, a 15/32 dia would be a great punch size in inches, 15/32= .468
And the closest size in MM for .45 Cal would be a 12MM hollow punch at .472 (a little big for a hard card, but perfect for wool)
For .50 Cal i hear guys refer to a 1/2dia Hollow punch, in my opinion that is to small and not giving a good solid seal, 1/2 dia = .500
A much better fit for .50 Cal would either be a 33/64 inch punch at .515 or a 13MM at .511
For .54 Cal a 9/16 inch hollow punch= .562 (again, a little large for hard card, but great for wool)
A better fit for .54 Cal would be a 14MM Hollow punch at .551
For .58 Cal a 15MM Hollow punch= .590, And the closest inch size would be a 19/32 at .593, Either of these would work great.