YOur 30 inch barrel will shoot 105 grains of powder efficiently, which is Way more powder than you would ever want or need to use in a Fowler. By comparison to the usual Fowler barrel lengths, your barrel is " Short". But, you probably know that a 30 inch barrel is considered a long barrel by modern standards. I have a 30" 20 gauge fowler, LH, that was made for me by a local gunbuilder. It would be an expensive gun to replicate these days, and probably more than you would want to spend for a first gun.
I do think the advise on the TVM site is the way to go.
When I started out I took the advice of others and bought a cheap, import rifle. Everything was wrong with it, but I used it to teach myself about locks, and fixing percussion guns, and that education has served me well, and helped dozens of other shooters over the years. But, I WAS NOT HAPPY shooting the RH action.
So, save your pennies, and buy that LH fowler. Mine is about 6 lbs. and a delight to carry in the field and to swing on flying gamebirds. I do have a rear sight, so it can be used also for shooting RB, and for hunting both Turkey and deer. It is an all around BP longgun, within its limits. Your thinking about your choice of gun is proper.
There is a huge learning curve for you to master to be able to shoot a flintlock fowler properly. But, there is plenty of help on this forum, if you are willing to read past posts, and topics, and then ask questions.
Do try to find a local club, and other shooters. Knoxville is East,and North of most of the area of Tennessee with which I am familiar. But, you are closer to Pennsylvania, and to both Ohio, Kentucky, and even Friendship, Indiana, where the National Muzzle Loading Rifle Association is headquartered. The NMLRA has charter clubs in all the states. A call to them will get you the phone numbers, and names of club contact people nearest you. If you go to the Links section at the top of the forum, you will find information to contact the NMLRA. Begin there.
A final Thought: if the comments from others here have you rethinking your choice of barrel lengths for that fowler, try finding one that has a 36 inch barrel. I think its a fine compromise, and would have been my next choice. I agree, however, that the longer, 42-48 inch barrels on fowlers do make better Round Ball guns, as the powder burns more completely, and the longer sight radius will help you in accurately placing your ball, at distances beyond 50 yards. Only you can decide how much RB shooting, and how much birdshot shooting you are likely to do with this gun. Only you know what kind of hunting terraine is available for you if you decide to hunt deer. For flying targets, be they clay or live birds, that 30 inch barrel with an open cylinder bore is hard to beat for handiness, in a 20 gauge. If I were shooting a 16, 14, or 12 gauge fowler, however, I would want a heavier gun, and would opt for the longer barrel lengths.
Most deer are found and shot in forests, or in the edge brush along forests. Shots are more often less than 50 yards, than over that. I have shot much shorter barrels than a 30 inch barrel when hunting deer, and I have absolutely no worry about being able to shoot deer with my 30"-barreled fowler within the reasonable range of my gun, and its sights.
Oh, you might also look at the Caywood Fowlers, as they run about $1,000, too. I handled one this past year, and it was well made.
Welcome to our form of madness! Its a disease that will make you smile a lot! :youcrazy: :shocked2: :rotf: :rotf: :thumbsup: