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William Kevin Stirling's career best to date is 555 kg, set in 2015, 13.3 years after their first recorded meet. Their total grew 75 kg over 12.9 years between their first meet and that mark (~5.8 kg/year). 2.7-year gap in their competition record between 2019 and 2022. Career variance was 64% squat-driven.
Career-best meet: World Masters Powerlifting Championships · IPF
| Date | Meet | Equipment | Squat (kg) | Bench (kg) | Deadlift (kg) | Total (kg) | DOTS |
|---|---|---|---|---|---|---|---|
| 2002-10-20 | World Powerlifting Championships | Raw | 170 | 115 | 195 | 480 | 332.59 |
| 2008-07-19 | Great Lakes Regional | Multi-ply | — | 175 | — | — | 103.1 |
| 2008-11-12 | World Championships | Single-ply | — | 175 | — | — | 108.31 |
| 2011-06-24 | World Single Lift Championships | Raw | 175 | — | — | — | 113.6 |
| 2012-05-01 | Ontario Championships | Raw | 175 | 127.5 | 210 | 512.5 | 334.58 |
| 2015-09-28 | World Masters Powerlifting Championships | Single-ply | 195 | 155 | 205 | 555 | 360.41 |
| 2018-05-05 | Alberta Provincials | Raw | 145 | 132.5 | 200 | 477.5 | 308.92 |
| 2019-05-04 | Bar Wars | Raw | 132.5 | 125 | 195 | 452.5 | 307.37 |
| 2019-10-03 | World Championships | Raw | 140 | 130 | 190 | 460 | 311.07 |
| 2022-06-11 | Belle River Open | Raw | — | 115 | — | — | 76.74 |
| 2022-11-26 | Drug Tested Tri-City Open | Raw | — | 117.5 | — | — | 80.49 |
| 2023-05-13 | Belle River Open Bench and 3 Lift | Raw | — | 115 | — | — | 76.41 |
| 2023-07-29 | Drug Tested Nationals | Raw | — | 117.5 | — | — | 78.9 |
| 2024-05-11 | Belle River Bench and Open | Raw | — | 115 | — | — | 79.2 |
| 2024-06-22 | Canadian Raw and Classic Raw Nationals | Raw | 100 | 115 | 150 | 365 | 251.7 |
| 2024-10-19 | Rose City Classic | Raw | 95 | 110 | 145 | 350 | 242.6 |
| 2025-07-12 | Kongs Strength Showdown 2 | Raw | — | 112.5 | 155 | — | 185.35 |
| 2025-07-26 | Rose City Classic | Raw | 100 | 112.5 | 155 | 367.5 | 252.65 |
| 2025-10-17 | OPA Open & Masters Provincial Championship | Raw | — | 110 | — | — | 75.23 |
| 2026-03-14 | Nationals | Raw | — | 110 | — | — | 73.82 |
vs Single-ply · 93 kg class · any age · drug-tested