I like my 357 mag barrel except always wished it was a little lighter contour(mines a late model barrel). This morning i grabbed a 357 and 22 hornet 158 barrels in the classifieds. i have fitted several barrels and am hoping to get the 158 357 barrel to fit either a sb2 or a 77 vintage Topper frame with the small firing pin. Anybody done this? Seems like i remember Tim fitting a 158 30-30 barrel to a sb2 frame but can't find the thread.....