Callaway Big Bertha vs Callaway Big Bertha OS
Side-by-side factory specifications. Differing values are highlighted.
Callaway Big Berthainvestment cast · 17-4 stainless steelCallaway Big Bertha OSinvestment cast · cast stainless steel with Exo-Cage construction, a next-generation 360 Face Cup and a tungsten-loaded internal standing wave
Specification comparison
| Club | Big Bertha loft | Big Bertha OS loft | Big Bertha lie | Big Bertha OS lie | Big Bertha length | Big Bertha OS length |
|---|---|---|---|---|---|---|
| 1 | 16 | — | 58.5 | — | 40 | — |
| 2 | 18.5 | — | 59.2 | — | 39.5 | — |
| 3 | 21 | — | 59.9 | — | 39 | — |
| 4 | 23.5 | 20.5 | 60.6 | 60.5 | 38.5 | 39.125 |
| 5 | 26 | 23 | 61.3 | 61.3 | 38 | 38.5 |
| 6 | 29 | 26 | 62 | 62 | 37.5 | 37.875 |
| 7 | 33 | 30 | 62.5 | 62.5 | 37 | 37.25 |
| 8 | 37.5 | 34.5 | 63.5 | 63 | 36.5 | 36.625 |
| 9 | 42 | 39 | 64.5 | 63.5 | 36 | 36 |
| PW | 46.5 | 44 | 65 | 64 | 35.5 | 35.75 |
| AW | 50.8 | 49 | 65 | 64 | 35.5 | 35.5 |
| SW | 55 | 54 | 65 | 64 | 35.5 | 35.25 |
| LW | 60 | — | 65 | — | 35.5 | — |
Highlighted cells differ between the two sets. Lofts and lies are factory standard.
Which should you choose?
The Big Bertha OS is the stronger-lofted set — up to 3° stronger than the Big Bertha on matching clubs. Expect longer carry per numbered iron but a flatter descent angle; gapping at the wedge end is where that shows up.
Both charts are reproduced in full on their own pages: Callaway Big Bertha specs and Callaway Big Bertha OS specs.