Ok guys - more info. Barrel Oregon Barrel, bore size 1.016, groove diameter 0.209, groove depth .009. Using Daryl's formula with this new info seems I could do:

.990 ball with . 020 - .025 patch
.995 ball with . 015 - .020 patch
1.00 ball with .010 - .015 patch

Guys am I safe to assume I would be ok with any of these choices give or take .005 on the patch?

Thx again!