| Event | Time | Meet | Date |
|---|---|---|---|
| 100m Backstroke | 1:17.16 | 2026 Central Region Div 2 SC Championships | 2026-02-20 |
| 100m Breaststroke | 1:31.32 | Scar Pan Am Winter Classic | 2026-01-16 |
| 100m Breaststroke | 1:32.41 | Paul Corkum Memorial 2025 | 2025-10-18 |
| 100m Butterfly | 1:21.39 | Scar Pan Am Winter Classic | 2026-01-16 |
| 100m Butterfly | 1:13.77 | 2025 Barrie Aquafest | 2025-10-31 |
| 100m Freestyle | 1:07.88 | Scar Pan Am Winter Classic | 2026-01-16 |
| 100m Freestyle | 1:04.38 | 2026 Steve Kingston Memorial | 2026-03-06 |
| 200m Butterfly | 2:50.11 | Winter Swimfest 2026 | 2026-01-24 |
| 200m Freestyle | 2:30.13 | Scar Pan Am Winter Classic | 2026-01-16 |
| 200m Freestyle | 2:26.47 | 2026 Steve Kingston Memorial | 2026-03-06 |
| 200m IM | 2:48.14 | Scar Pan Am Winter Classic | 2026-01-16 |
| 200m IM | 2:40.37 | 2026 Central Region Div 2 SC Championships | 2026-02-20 |
| 400m Freestyle | 5:25.96 | Paul Corkum Memorial 2025 | 2025-10-18 |
| 50m Backstroke | 36.71 | Scar Pan Am Winter Classic | 2026-01-16 |
| 50m Backstroke | 34.31 | 2026 Central Region Div 2 SC Championships | 2026-02-20 |
| 50m Breaststroke | 42.13 | Scar Pan Am Winter Classic | 2026-01-16 |
| 50m Breaststroke | 38.78 | 2026 Steve Kingston Memorial | 2026-03-06 |
| 50m Butterfly | 33.15 | Scar Pan Am Winter Classic | 2026-01-16 |
| 50m Butterfly | 32.01 | 2025 Barrie Aquafest | 2025-10-31 |
| 50m Freestyle | 31.01 | Scar Pan Am Winter Classic | 2026-01-16 |
| 50m Freestyle | 29.62 | 2026 Central Region Div 2 SC Championships | 2026-02-20 |
Hullachan, Callum's top personal bests include 100m Backstroke (1:17.16), 100m Breaststroke (1:31.32), 100m Breaststroke (1:32.41), 100m Butterfly (1:21.39), 100m Butterfly (1:13.77).
Hullachan, Callum swims for Pickering Swim Club Inc.
Hullachan, Callum has competed in 7 meets.