310 lb works out to 3x45 per side plus the bar — call it 315 lb in practice, since gyms rarely stock the odd change. 2 reps sits at the reliable end of the range these formulas were fitted on, so the 26 lb spread here is about as tight as the method gets. Your 295 lb set represents about 95% of the estimated max.
Why 2 reps gives a tight estimate
A double is the shortest set these seven equations accept, and it is where they agree most closely. Every one of them was regressed on sets of two to ten reps, so two sits at the near edge of the fitted band rather than outside it, and the 26 lb between 303 and 329 lb is about as narrow as this method ever gets. The uncertainty at two reps is not in the arithmetic, it is in the set: a double you could have taken one rep further looks identical on paper to one that genuinely stopped you.
Training loads from a 310 lb max
Programmes are written as percentages of the max, not as absolute weights. From 310 lb, rounded to the nearest 5 lb:
| Percentage | Load | Typical set |
|---|---|---|
| 95% | 295 lb | Heavy single |
| 90% | 280 lb | Doubles and triples |
| 85% | 265 lb | Sets of four to five |
| 80% | 250 lb | Sets of six |
| 75% | 230 lb | Sets of eight |
| 70% | 215 lb | Volume work, ten or more |
310 lb is 3x45 per side plus the bar — 315 lb loaded. Plate maths gets easier at this weight, because most of the jumps land on whole 10s and 25s. The bottom three rows of that table are worth rounding generously; the top two are where you want to be precise, since 5 lb at 95% of 310 lb is the difference between a single and a missed single.
The formulas behind this answer, and their limitations
The table above the fold is Epley (1985), Brzycki (1993), Lombardi (1989), O'Conner (1989), Wathan (1994), Lander (1985) and Mayhew (1992), each applied to 295 lb for 2 reps; the headline figure is their median. All seven assume a set taken close to failure with clean technique. At 2 reps you are inside the band they were fitted on, so the largest error here is not the equation but judging how close your set really was to failure — three reps left in the tank reads exactly the same to them. They also under-rate strong, experienced lifters, who hold a higher percentage of max at any rep count than the regression average. The full account — the populations behind each equation, what a bounced rep does to it, and why we stop at ten reps — is set out on the methodology page. Warm up thoroughly and use safety bars or a spotter before going anywhere near 310 lb. This is a training estimate, not medical advice.