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The Big Bertha OS is Callaway's answer for the golfer who wants the ball up in the air and gone, no questions asked. OS stands for oversize, and that's exactly what you get. The heads are big, the soles are wide, and the offset is generous. This is a set built to hide mistakes, not reward precision.
Callaway went hollow-body here, filling the head with a cup-face design that lets the whole face flex at impact. That's where the distance comes from, along with lofts that run strong for the category. The 7-iron sits at 28.5 degrees, and the 4-iron is a 19-degree club that most people would have called a 2-iron a couple decades ago. Combine the strong lofts with the launch help built into the head, and you get long shots that still come down soft enough to hold a green.
This is a super game improvement iron, and it never pretends otherwise. If you're a mid-to-high handicapper who slices, tops the ball, or just wants easier golf, the OS was made for you. Better players will find it too chunky and too hot off the face to control, and that's fine. It was never aimed at them.
In short
The Callaway Big Bertha OS (2015) is a maximum-forgiveness iron for slower swings and higher handicaps. The set runs 4-iron to PW with a 28.5° 7-iron. It carries a $799 MSRP.
Refresh due soon
Brands in this category update about every 2 years, and the Big Bertha OS is 11 years old with no successor yet, so a new model could land any time. Grab it at clearance pricing now, or wait a few weeks to see what replaces it.
Based on release timing and this line's typical refresh cycle, not a live price quote.
Modeled from the $799 original MSRP and a 11-year-old release (about 12% of MSRP retained used).
Used market value
$80 - $105
Private sale, fair to like-new
Trade-in value
$50 - $75
What a shop typically pays
Get an exact quote
Estimate only, from a depreciation model, not a live quote. Search “Callaway Big Bertha OS” on the sites above for the real number, which varies with condition, shaft, and demand.
| 4i | 5i | 6i | 7i | 8i | 9i | PW |
|---|---|---|---|---|---|---|
| 19.0° | 22.0° | 25.0° | 28.5° | 32.5° | 37.0° | 42.0° |
Stock steel shaft. Lofts are approximate and subject to manufacturing tolerances.
Typical carry by swing speed, adjusted for this set's actual lofts. Your numbers will vary with strike, shaft, and conditions.
| Club | Loft | Moderate swing~143y 7-iron | Average swing~158y 7-iron | Faster swing~172y 7-iron |
|---|---|---|---|---|
| 4-iron | 19° | 170 y | 188 y | 205 y |
| 5-iron | 22° | 162 y | 179 y | 195 y |
| 6-iron | 25° | 153 y | 169 y | 184 y |
| 7-iron | 28.5° | 143 y | 158 y | 172 y |
| 8-iron | 32.5° | 133 y | 147 y | 160 y |
| 9-iron | 37° | 122 y | 135 y | 147 y |
| PW | 42° | 112 y | 124 y | 135 y |
Carry distances are modeled from TrackMan-based norms scaled to each club's loft, not measured for this exact model.
The hollow head is the whole story. Callaway used a cast 17-4 stainless body with an internal cup face that wraps around the leading edge, so the face flexes and springs the ball forward even on strikes away from center. Inside sits a standing wave of weight that pushes the center of gravity low and back, which is why these launch so high with so little effort. The wide sole and low CG work together to get the ball climbing, and the extra perimeter weighting from the oversize shape keeps mishits from dying off to the side. Offset is heavy through the set, which helps square the face for players who leave it open and slice. The topline is thick and the whole club looks confidence-inspiring at address, big and blocky in a way that tells you it's going to help. None of this is subtle, and it isn't meant to be.
The Callaway Big Bertha OS's 7-iron is lofted at 28.5° - moderately strong - slightly stronger than traditional lofts. For a golfer with an 85-95 mph swing speed, this projects to a 7-iron carry of approximately 155-165 yards. The 5-iron (22°) to 7-iron gap of 6.5° is well-gapped, which may create overlapping distance windows with similarly lofted fairway woods or hybrids. The pitching wedge at 42° is relatively strong - consider a gap wedge of 46-48° to bridge the distance to your sand wedge.
The lofts are strong for a game improvement iron, with the 7-iron at 28.5 degrees and the PW at 42. On paper that sounds like it would fly low and run out, but the hollow head launches the ball high enough that it still lands soft. You'll gap your set differently than a traditional set, so expect your wedges to fill the space below the 42-degree PW.
The OS is the more forgiving, higher-launching version. It has a bigger head, a wider sole, more offset, and a lower center of gravity than the standard Big Bertha. If you want easy height and maximum help on mishits, go OS. If you want something a little more compact and workable, the standard model is the better fit.
Yes. This is one of the easier irons Callaway has made for a new or high-handicap player. The wide sole glides through turf instead of digging, the offset helps square the face, and the low center of gravity gets the ball airborne without a perfect strike. It's a lot of forgiveness in one package.
Probably not. The head is large, the offset is heavy, and the face is hot, which makes it hard to control trajectory and distance precisely. Low handicappers who want to shape shots and dial in yardages will feel like the club is doing too much for them. This is a forgiveness-first iron, not a shotmaker's tool.
This version of the Big Bertha OS launched in 2015. It sits in Callaway's super game improvement line for that era, before later reworkings of the Big Bertha name. If you're buying used, check the year, because Callaway has reused the Big Bertha badge across very different designs.
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Use as your baseline in the recommendation tool, or compare side-by-side with another set.