FN made Mauser 98 actions with the thumb cut and the loading clip slots in the rear bridge and C collar. It had the long front trigger guard tang as the military Mausers had with the lock screw on the outside. This action was called the "Peerless" and was manufactured from the mid 1920,to around 1940. This action has a bent down bolt handle not designed for scope use. Actions were available to the public and Husqvarna purchased these actions and polished the "Fab National Armes de Guerre" off the left receiver wall to make their early Hi-Power rifles.( I can barely make out the words on my 1940, 146). The model 146 uses this action and is available only in 9.3x57. The 246 was made in very limited numbers (about 237) and were chambered only in 9.3x62.It also uses this action. If the stock is removed all the Belgian proof marks can be seen on the left front receiver ring.In 1947 FN started transitioning by adding a swept back bolt handle, shorter front tang with lock screw on inside ," 1947 model", then removing the thumb cut and changing to the H collar and by 1950 removed the hump and clip slots in the rear bridge and drilled and tapped for scope and peep sight, contoured the trigger guard, added an extended floor-plate release and omitted the lock scews. to produce the "Deluxe action". This was used by Roy Weatherby to make the first Weatherby magnums.Actions were also bought by JC HIggins, Colt and others because of their relatively low cost due to the European economic woes of the time. In 1959 FN came out with the "Supreme" action with streamlined bolt shroud and hinged floor plate, three position side safety and improved trigger.
FN "1947"action on Husqvarna 1947 Mod. 640, 9.3x62

FN "Peerless" action on 1939 Husqvarna 146, 9.3x57

FN "Supreme" action, 1960 Browning Safari .375 H&H