since day 1..
all modern Stolle/Kelbly actions have spiral fluted bolts ...you can order the bolt without flutes if u like,or straight flutes...the spirals do just as you suggested ,,plus ,less friction as the bolt moves fore and aft in the action ...and due to the flutes being spiral,,there is no -clik-clik as the bolt is clyled over a ctg. in the magazine ..(if used as a repeater!!)....hope this helps....Roger