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Bill Clayton's career best to date is 567.5 kg, set in 2003 at age 49. 3.1-year gap in their competition record between 1986 and 1989.
Career-best meet: Masters National Powerlifting Championships · USAPL
| Date | Meet | Equipment | Squat (kg) | Bench (kg) | Deadlift (kg) | Total (kg) | DOTS |
|---|---|---|---|---|---|---|---|
| 2003-05-02 | Masters National Powerlifting Championships | Single-ply | 217.5 | 137.5 | 212.5 | 567.5 | 388.99 |
| 2003-08-22 | Bench Press Nationals | Single-ply | — | 132.5 | — | — | 89.75 |
| 2004-04-21 | World Masters Bench Press Championships | Single-ply | — | 135 | — | — | 92.48 |
| 2005-04-20 | World Masters Bench Press Championships | Single-ply | — | 142.5 | — | — | 97 |
| 2006-03-25 | Bench Press Nationals | Single-ply | — | 112.5 | — | — | 76.56 |
| 2006-09-02 | Bench Nationals II | Single-ply | — | 142.5 | — | — | 96.85 |
| 2007-05-04 | Masters Nationals | Single-ply | 205 | 137.5 | 207.5 | 550 | 374.69 |
| 2007-06-20 | North American Powerlifting Championships | Single-ply | 147.5 | 145 | 210 | 502.5 | 343.99 |
| 2008-05-02 | Masters Nationals | Single-ply | 187.5 | 150 | 197.5 | 535 | 363.91 |
| 2008-08-30 | Bench Press Nationals | Single-ply | — | 140 | — | — | 95.23 |
| 2009-05-04 | Masters Nationals | Single-ply | 190 | 130 | 200 | 520 | 355.06 |
| 2009-12-12 | Massachusetts and Rhode Island Open State | Single-ply | 205 | 142.5 | 212.5 | 560 | 375.29 |
| 2010-04-30 | Masters Nationals | Single-ply | 210 | 145 | 202.5 | 557.5 | 378.43 |
| 2010-12-04 | American Open | Raw | 182.5 | — | 202.5 | — | — |
| 2012-07-23 | North American Powerlifting Championships | Raw | 175 | 100 | 100 | 375 | 255.26 |
| 2013-07-01 | Pan-American Powerlifting Championships | Raw | 167.5 | 100 | 190 | 457.5 | 313.41 |
| 2014-07-17 | Raw Nationals | Raw | 165 | 92.5 | 197.5 | 455 | 316.58 |
| 2014-09-21 | World Masters Powerlifting Championships | Single-ply | 185 | 135 | 200 | 520 | 353.83 |
| 2015-05-15 | Men's and Women's Nationals | Single-ply | 192.5 | 137.5 | 197.5 | 527.5 | 358.06 |
| 2015-09-28 | World Masters Powerlifting Championships | Single-ply | 192.5 | 137.5 | 197.5 | 527.5 | 358.36 |
| 2015-12-04 | American Open | Raw | 145 | 92.5 | 182.5 | 420 | 285.69 |
| 2016-05-20 | Open Nationals | Single-ply | 200 | 90 | 200 | 490 | 332.15 |
| 2016-10-03 | World Masters Championships | Single-ply | 200 | — | 100 | — | — |
| 2017-05-19 | 35th Annual Open National Championship | Single-ply | 185 | 92.5 | 202.5 | 480 | 327.19 |
| 2017-10-01 | World Masters Powerlifting Championships | Single-ply | 192.5 | 125 | 200 | 517.5 | 353.25 |
| 2018-02-03 | SBWC Winter Invitational | Raw | 165 | 90 | 195 | 450 | 307.94 |
| 2018-05-18 | Open Nationals | Single-ply | 145 | 122.5 | 187.5 | 455 | 315.15 |
| 2018-10-02 | World Masters Powerlifting Championships | Single-ply | 182.5 | 117.5 | 192.5 | 492.5 | 336.42 |
| 2019-02-02 | SBWC Box of Rats Invitational | Raw | 147.5 | 75 | 177.5 | 400 | 290.48 |
| 2021-11-21 | Ron Falcone Invitational | Single-ply | 125 | 75 | 125 | 325 | 235.6 |
| 2022-10-08 | World Masters Classic & Equipped Powerlifting Championships | Single-ply | 145 | 87.5 | 160 | 392.5 | 272.06 |
| 2023-06-01 | Last Chance Qualifier | Single-ply | 25 | — | — | — | 51.93 |
| 2023-06-04 | Equipped Nationals | Single-ply | 25 | 25 | 30 | 80 | 55.04 |
| 2023-10-08 | World Masters Classic & Equipped Powerlifting Championships | Single-ply | 142.5 | 105 | 177.5 | 425 | 295.59 |
| 2024-05-19 | Equipped National Championships | Single-ply | 137.5 | 100 | 150 | 387.5 | 264.51 |
| 2024-05-22 | World Bench Press Championships | Single-ply | — | 100 | — | — | 66.93 |
| 2024-10-05 | World Classic & Equipped Masters Powerlifting Championships | Single-ply | 137.5 | 97.5 | 150 | 385 | 259.04 |
| 2025-05-28 | Classic and Equipped Age Division Nationals | Single-ply | 140 | — | 172.5 | — | — |
vs Single-ply · 83 kg class · masters-4 · USA · drug-tested + not tested
vs Single-ply · 83 kg class · masters-4 · drug-tested + not tested
vs Single-ply · 82.5 kg class · masters-1 · drug-tested