OP
Do you know approx when your 10-10 was made? See in 96 every thing switched over to a round butt and it was a whole year before MIM came and changed the dash variation. These 96 round butt guns are the best candidates for 3 inch barrel swaps. I have a 64-5 round butt I converted to 3 inch 357
Yessir.... 1996.
Incidentally, I also have a 64-5 that I had re-barreled from 4" to 3. (Great minds, etc.) However I kept it as a .38 (I have a 3" Model 65) and mine is a 1995 vintage. That gave me 2", 3" and 4" Model 64s.