If the #11's are too tight, why not just chuck each nipple in your drill and take them down a little on a grinding stone so the 11's fit right? Just be sure to keep the taper, and go a little at a time and then try a cap on them until you get them all right. Shouldn't take that long to do.
Get your balls or bullets up to 1000 fps- easily done and it will shoot through a deer or at least park under the skin on the far side. A lot of people shoot deer with them and report good results.
4fg. I had a friend who would use nothing else in his 1960s, brass framed navy and a dragoon or so. He said the 4f fouled less than ff or fffg. Some people think it might raise pressuers too much but I doubt that any black powder will do that.
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