...Also prevents hammer blow back. This info is from an old "Gun Digest". I've used them on rifles but can't say I found them better or worse then any other good quality nipple.
Kent,
That would make sense because the back blast could also vent out the cross drilled holes instead of just straight back towards the hammer face. Since the Hot Shot tubes have larger flash holes there is going to be significant back blast coming back through that cone.
But, It's like I said before, you can get away with a lot on a single shot rifle. With a single shot you don't have to worry about blasting your caps into the action, the hammer channel or even shredding the caps because there are no quick follow up shots. From the experience I have had with muzzleloaders I find a reduced flash hole on the Treso works well and with all of the other advantages it offers such as strength, precision fit to the caps, erosion resistance I would tell anyone to try it for the small price it is for one tube.
For a revolver, Treso tubes are the very first thing I recommend as a purchase to a new shooter on their path to making a reliable percussion revolver. There are many other things to do to a revolver on that path but this is the first one that involves a purchase.
~Mako