I'm not sure what length you are trimming to.
My 44Russian cases are .960" long and the wall thickness is about 0.012" for the first half inch or a little more. It thickens up fairly quickly after that.
Do you know if there is anywhere that would give internal case dimensions to compare?
The case length on the 44 Webley is 0.657in
How is the chamber reamed? Straight through, or does it have a lip in it?
If straight through, you don't have to cut the brass down as much.
I have a 360 Webley that will take 38SPl brass, even though the brass is almost twice the length of the correct brass.
Just eyeballing it looks like my 44 Russian brass is already thickened up at .7". I think you'd have to ream it.
This is not really doable with black powder, using a compressed load I cannot leave the case long unless I am increasing the powder and that is not happening in my case. On this gun there is a lip anyway, the cylinder is a lot longer than needed as it is the same length as a 38 rimfire long but a longer case is an issue.
I can still seat the cases in the 44 Special cases cut down but I was wondering if the 44 Russian case has less taper, if they have less taper I would go out and find some 44 Russian brass to trim down and make seating a lot easier.
it looks like the taper is finished and the wall thickness is full size at .7" is what I was trying to say, so there wouldn't be any advantage.