I would go with a stainless S&W Mountain Gun, without the lock if possible. They are of course stainless and also a little lighter than a traditional N frame, making them perfect for carrying for long periods of time in the field working. They were made in 357, 41, 44, 45 acp, and 45 colt. As mentioned earlier I would go with a 41 if you reload if not, the 44 mag would work great and as a bonus the 44 mag variety is the easiest to find.