Chasing OTs 211, were in trouble at 20-3, but Howgrave-Graham took complete control, the Bath rugby prospect smashing four huge sixes and 11 fours, his 104 coming off 88 deliveries.
Kantolinna, who shared six of the OTs wickets with Jayden Atkinson, played a superb support role as South Wilts romped to victory.
Rightly proud of their colts set up, South Wilts turned out over 80 per cent of home grown players last weekend, winning all four SPL and HCB mini-league games.
The fourths bowled Shrewton out for 122 (Chris Newbury 42) and won by six wickets on the back of an unbroken fifth-wicket stand between Oli Hill (44) (top right) and Max Allen (41). Tom Morton tip toed back in action for the first time this season following surgery, but was caught for 11. His time will come ...