Greetings WalrusKid,
Mnay of the bench guns are built by the men who shoot them. There are not as many bench gun makers today as back in the 60's, 70's, and 80's so that makes purchase of one somewhat more difficult.
Moving on from that, finding a new good bench barrel maker is your first objective. Three or four years back, a good shooting friend, purchased a Goodien bench barrel with false muzzle for close to $400.00. That false muzzle is a must for serious bench shooting.
Kenneth Bresien is no longer in the business, having sold all of his equipment a gentleman who is a top flight bench shooter and is producing a few barrels a year. Perhaps, some of the forum members know of other barrel makers who produce the heavy bench barrels.
Next is to decide if you want to shoot PRB or elongated slug. The rifling style is completely different for each projectile. PRB's are IMO much easy to shoot. Making an accurate slug is a real PITA.
Do you want a round barrel or an octagon barrel? Octagon barrels are easier to mount sights.
An action is the next step. The old H&A underhammer actions if tuned make a good basic action. Yes, there are better actions, maybe, but the cost is much greater. If you have some craft skills, MUZZLELOADER BUILDERS SUPPLY has a nice underhammer action kit for $60.00. I have seen a number of these actions make up into some very nice rifles.
Then there is another alterative. A heavy barrel flintlock bench rifle. A flint bench rifle gives away nothing in accuracy when competing against any other type of action. It also has the advantage of be able to compete in both the flint and percussion bench rifle matches.
And then there is the question of weight. My Bresien bench rifle weighs 51 pounds, and is not that much fun to shoot any more. A number of fellow shooters are quite happy with 30-35 pound rifles and win with them. In addition, their endurance to handle the lighter rifle is not pushed to the max. With my rifle, I have to lift and carry 100 pounds for each shot. Fire 30 shots per day, and that is a total of 3000 pounds that is handled and carried. At the end of a day I am considerably wore down from a day of shooting a 51 pound rifle. I am thinking about having the barrel planned down to octagon to unifomly reduce the weight.
Bench rifles are a lot of fun, and I know you will enjoy the accuracy of a good one.
Best regards and good shooting,
John L. Hinnant
If you are not an NRA Member, why not? I am carrying your load.