All;

Does anyone have experience resizing bottle corks for use as wads?
I have a bunch of used wine bottle corks that are slightly too large to work in 12 bore cartridges.
My supply of obsolete WW red wads that I use for black powder loads is running low.
I would also like to eliminate the plastic fouling that is deposited when using plastic wads with black powder.
Is there an easy way to cut these oversize corks down to the correct diameter?
What would the correct diameter be for a .730 bore?

Also, is a nitro card required when using cork wads with BP?
My typical loads are square loads with the dipper set at 1 or 1-1/8 oz. in Activ or STS hulls.

P.S.
I have a friend who works at a winery, I didn't personally drink the thousand bottles of wine...

Thank You
Bob 1900