Callaway Big Bertha B21 Irons Review

Our verdict on the new Big Bertha B21 irons from Callaway

Callaway Big Bertha B21 Irons Review
(Image credit: Golf Monthly)
Golf Monthly Verdict

The Big Bertha B21 iron is ideal for high-handicap golfers that struggle with launch and strike. There is a lot of technology to help get the ball up with more speed while the feel off the face is also pleasing on the senses.

Reasons to buy
  • +

    Looks inviting to hit

  • +

    Gets the ball up easily

  • +

    Creates a strong, towering and draw-biased trajectory

  • +

    Consistent performance from a variety of strike locations

Reasons to avoid
  • -

    Not everyone will like the look of the offset at address

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Callaway Big Bertha B21 Irons Review

The Callaway Big Bertha B21 irons are the first Big Bertha irons to be designed using Artificial Intelligence. On the face of it, there appears to be a lot of crossover here with the Mavrik Max iron, both of which are irons designed for high-handicap players.

If you like a chunky-looking iron with a thick top edge and lots of offset, you’re in luck with the Big Bertha B21. It’s got a lighter, more satin finish than the Mavrik Max iron and has a shallower face, which makes it look less lofted than it is. Other than that, the address profiles and shapes are very similar.

mavrik-max-v-b21-address-web

How the Big Bertha B21 iron (left) compares with the Mavrik Max iron at address.

We tested the 29° B21 7-iron on the Foresight Sports GCQuad launch monitor with Titleist Pro V1x balls against the 30° Mavrik Max 7-iron. As you might expect, the B21 did launch fractionally lower given the stronger loft and did produce a fraction more ball speed. Both irons produced similar spin around the 5,200 rpm mark on a similar trajectory, resulting in average carries of 184 yards for the B21 and 185 yards with the Mavrik Max.

Ball flight wise, both seemed to offer a similar amount of draw assistance and through the ground, the wide sole helped to prevent the club digging on those slightly heavy contacts.

So it would appear the two irons offer very similar performance, which begs the question as to what purpose the B21 iron is serving being added to the range. One difference we noticed was with the feel of these clubs. The B21 did feel a touch more solid and seemed to have a slightly quieter sound than the Mavrik Max that was no less explosive, but the differences were fairly minor. We got a little more draw bias out of the B21 too so if you tend to miss approach shots to the right it could help you control direction a little more easily.

Joel Tadman
Technical Editor

Joel has worked in the golf industry for over 12 years covering both instruction and more recently equipment. He now oversees all product content here at Golf Monthly, managing a team of talented and passionate writers and presenters in delivering the most thorough and accurate reviews, buying advice, comparisons and deals to help the reader find exactly what they are looking for. So whether it's the latest driver, irons, putter or laser rangefinder, Joel has his finger on the pulse keeping up to date with the latest releases in golf. He is also responsible for all content on irons and golf tech, including distance measuring devices and launch monitors.


One of his career highlights came when covering the 2012 Masters he got to play the sacred Augusta National course on the Monday after the tournament concluded, shooting a respectable 87 with just one par and four birdies. To date, his best ever round of golf is a 5-under 67 back in 2011. He currently plays his golf at Burghley Park Golf Club in Stamford, Lincs, with a handicap index of 3.3.


Joel's current What's In The Bag? 

Driver: Titleist TSR3, 9° 

Fairway wood: Titleist TSR3, 15° 

Hybrid: Titleist TSi2, 18° 

Irons: TaylorMade P770, 4-7 iron, TaylorMade P7MC 8-PW 

Wedges: Titleist Vokey SM8, 50°, 54° and a Titleist Vokey SM9 60° lob wedge 

Putter: Evnroll ER2V 

Ball: 2021 Titleist Pro V1x