Every month,Muzzle Blasts has the listings state by state for muzzle loading clubs.
Also contact info for representatives of the NMLRA.
Bob Roller
Bob, you just beat me to it as I was preparing a response, but here it is anyway.
Members of the National Muzzle Loading Rifle Association can check their monthly magazine,
Muzzle Blasts to help connect with other BP shooters. Each month the magazine lists either all the shoots of every NMLRA in the country, by state, with contact information or all their Field Representatives by state with contact information.
If you go to one of the shoots in your area you'll meet other BP shooters and can probably arrange to get together with some of them and shoot informally. Most shoot more often than just at a monthly club match.
Contacting the nearest NMLRA Field Rep is another way to meet other BP shooters in your area. Most of us are more than willing to hook up with other shooters and get them shooting with us whether they are NMLRA members or not. If you're not a NMLRA member, check it out at nmlra.org.