Joe
I just left this piece of wisdom on the ASSRA site.

I think a good used #1 ruger could be bought for what is spent on a prehistoric Trapdoor and not thinking about the thing blowin up.
Here is Dick Trenks opinion of Trapdoor strength And i think it is more valid than some one who screws various barrels into a TD action.I think the fact that a barrel coming out of a receiver is due to his lack of thread fitting skills which to me negates the whole theory.
Read and learn
http://www.theopenrange.net/forum/index.php?topic=494.0

Tom