851c,
When I speak of using 38-55 cases, I mean original length cases which were 2.125-130" long. A few years ago, there was a "run" of 38-55 ammo for a commemorative rifle and they used 30-30 length (2.085") cases, for convenience. Since then, common 38-55 cases have been the shorter length. However, Starline makes both length cases and refer to the original length ones as "long". A recent check "online" indicates that the longer cases are available now (they are "seasonal"). I got my first 9.3x72R from a friend that had tried making cases by soldering cut-off 38 special case bodies to necked up 30-30 cases. He was very competent but was unable to make the idea work to his satisfaction. He used soft solder, and silver solder would take enough heat that it is less likely to be successful. If you have a .375 Win. rifle, you might be better off to save your cases for it and use fireformed 30-30 cases for the Reilly if you can't use long 38-55 or 9.3x72R cases; .375 Win. cases are not plentiful either. Some people with rifles chambered for 9.3x72R "D" form are able to use "N' (normalized) form commercial ammo by sizing it slightly in a 38-55 file/trim die or sizing die (the type that has the decapping stem in a bushing large enough that when removed will allow the cartridge to pass through). The cartridges only need to be sized enough to chamber. Once fired in a "D" form chamber, the cases can be reloaded in normal 9.3x72R dies. FWIW, chambering to "N" form from "D" form never required reproofing the rifle.
You mentioned that North Georgia deer are not really large, I take from that you live in North Georgia. What part? I have family that live in various north Georgia areas.
Mike
