I have always heard of these things not being accurate, but mine is a tack driver. It is older, but I dont know HOW old, or what the twist is. It is extremely accurate with 50, 55 and even 70 gr. bullets.
A little history.....It didnt come with the indentations to fit scope rings, I had to have it drilled and tapped. Also, it dosent have the perforated metal muzzle guard/forend, It is all made of wood. I bought it from a guy who hardly used it. He bought it after getting charged by a pig, and I dont think he ever really used it, so the barrel is not shot out, and I have been careful with it. Never have been able to find out much about it, but it is extremely accurate out past 400 yds. Would this be one of the 92-93 models that you mentioned? The only drawback is that it dosent seem to like the new little 35 gr. bullets.