The Callaway Big Bertha OS iron lineup runs from 21° to 49° across 8 factory loft options. The 7-iron is 31° and the highest-lofted option is the approach wedge at 49°.
Big Bertha OS Lofts & Loft Chart
Factory loft map and model-specific gap analysis
Big Bertha OS Loft Chart
| Club | Loft | Loft Gap | Gap Read |
|---|---|---|---|
| 4i | 21° | — | — |
| 5i | 24° | 3° | Tighter than model median |
| 6i | 27° | 3° | Tighter than model median |
| 7i | 31° | 4° | Near model median |
| 8i | 35° | 4° | Near model median |
| 9i | 39° | 4° | Near model median |
| PW | 44° | 5° | Wider than model median |
| AW | 49° | 5° | Wider than model median |
What stands out about the Big Bertha OS lofts?
Gap pattern: Median gap is 4°. Tightest: 4i→5i (3°), 5i→6i (3°). Widest: 9i→PW (5°), PW→AW (5°).
Big Bertha OS loft progression
The 31° 7-iron is the clearest single reference point for how this set is lofted. Loft helps explain distance structure, but it does not by itself predict launch, spin or carry.
Where are the tightest and widest loft gaps?
The tightest static gap is 3° between 4-iron and 5-iron. The widest is 5° between 9-iron and pitching wedge. Those are the first transitions worth checking if real carry gaps look compressed or stretched.
Big Bertha OS vs other Callaway iron lofts
This comparison uses the same benchmark club where possible and deliberately shows nearby lower, similar and higher lofts when available.
| Callaway Model | Benchmark Club | Loft | Difference |
|---|---|---|---|
| Big Bertha OS | 7i | 31° | This model |
| Apex 21 | 7i | 30.5° | 0.5° lower loft |
| Apex Ai150 | 7i | 31° | Same loft |
| Big Bertha 2008 | 7i | 31° | Same loft |
| Rogue ST Max OS Lite | 7i | 31.5° | 0.5° higher loft |
| Apex | 7i | 30° | 1° lower loft |
What traditional iron lofts are the Big Bertha OS closest to?
This is a static-loft comparison only; it does not mean the clubs launch, spin or carry the same.
| Callaway Club | Actual Loft | Closest Traditional Loft |
|---|---|---|
| 4-iron | 21° | 3-iron (~21°) |
| 5-iron | 24° | 4-iron (~24°) |
| 6-iron | 27° | 5-iron (~27°) |
| 7-iron | 31° | 6-iron (~31°) |
| 8-iron | 35° | 7-iron (~35°) |
| 9-iron | 39° | 8-iron (~39°) |
Which Big Bertha OS club has each loft?
- 21° = 4-iron.
- 24° = 5-iron.
- 27° = 6-iron.
- 31° = 7-iron.
- 35° = 8-iron.
- 39° = 9-iron.
- 44° = pitching wedge.
- 49° = approach wedge.
Individual Big Bertha OS loft answers
What loft is the Callaway Big Bertha OS 4-iron?
The Big Bertha OS 4-iron is 21°. It is the lowest-lofted option in this model.
What loft is the Callaway Big Bertha OS 5-iron?
The Big Bertha OS 5-iron is 24°. It has 3° more loft than the 4-iron.
What loft is the Callaway Big Bertha OS 6-iron?
The Big Bertha OS 6-iron is 27°. It has 3° more loft than the 5-iron.
What loft is the Callaway Big Bertha OS 7-iron?
The Big Bertha OS 7-iron is 31°. It has 4° more loft than the 6-iron.
What loft is the Callaway Big Bertha OS 8-iron?
The Big Bertha OS 8-iron is 35°. It has 4° more loft than the 7-iron.
What loft is the Callaway Big Bertha OS 9-iron?
The Big Bertha OS 9-iron is 39°. It has 4° more loft than the 8-iron.
What loft is the Callaway Big Bertha OS pitching wedge?
The Big Bertha OS pitching wedge is 44°. It has 5° more loft than the 9-iron.
What loft is the Callaway Big Bertha OS approach wedge?
The Big Bertha OS approach wedge is 49°. It has 5° more loft than the pitching wedge.
Big Bertha OS Loft Intelligence
These derived specs show how the numbered irons are structured instead of only repeating the factory lofts.
31° loft
vs ~35° traditional 7i
3.6° average
Moderately varied
Iron-only spacing: The tightest numbered-iron gap is 3° from 4i to 5i. The widest is 4° from 6i to 7i.
Progression shape: The long irons are more compressed at 3° average spacing versus 4° through the mid/short numbered irons.
Loft Consistency Score: 66/100. This derived score measures variation in numbered-iron loft gaps. A score of 100 means perfectly even static-loft spacing.
Spec note: Factory lofts can vary by model year, region, handedness or special configuration. Verify an exact club against Callaway documentation when a single degree matters for fitting, replacement or bending.