Great response! I'm a new owner of a 65-1, all original except it has had the grip frame modified to round butt. I have a set of Uncle Mikes square butt adapter grips on it, as I prefer SB. I say all this because I'm assuming that a 4"HB 65-1 was originally a SB.
Is the 65-1 in the same category as 19s in that they should not be subjected to a steady diet of full power 357 ammunition?