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New Mizuno JPX923 irons: Everything you need to know

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What you need to know: Mizuno is launching the successor to its JPX921 series. Engineers leveraged the company’s custom-fitting program — including data from 350,000 golfers — in the creation of the JPX923 series, which includes five models: JPX923 Tour featuring a new V-Chassis and thinner topline, JPX923 Forged with features Mizuno’s third generation of chromoly forging, JPX923 Hot Metal, JPX923 Hot Metal Pro, and JPX Hot Metal HL all featuring new, faster 4335 nickel chromoly, which is 35 percent stronger than Mizuno’s original chromoly.

Mizuno JPX923 irons: What’s new, key technology

JPX923 Tour

Featuring a copper underlay for “Mizuno feel,” the JPX923 Tour is one-piece Grain Flow Forged in Hiroshima Japan from 1025E Pure Select mild carbon steel. Narrower top line and sole in tandem, more rounded trailing edge for cleaner turf interaction.  Features Mizuno’s new ‘V-Chassis’.

“The goal was to engineer a compact, players cavity back that looked and felt like a muscleback at impact. With the copper underlay and new topline, the JPX923 Tour is right there,” says David Llewellyn.

JPX923 Forged

Mizuno’s third-generation of chromoly forging places a wider milling slot heel to toe in the 4120 chromoly 4 through 7-irons as well as well as a thinner clubface. JPX923 Forged are mid-sized, full body Grain Flow Forged irons with a thinner topline and bevelled sole throughout. The scoring irons (8-GW) also feature more compact design and are forged from 1025E Pure Select mild carbon steel.

“The new JPX923 Forged pulls off two impressive achievements. First it feels more solid even though it’s faster from the face. Second, it looks sleeker with a thinner topline and narrower sole even though it plays more forgiving,” says Chris Voshall, Mizuno’s Director of Product.

JPX923 Hot Metal, Hot Metal Pro, Hot Metal HL

With the JPX923 Hot Metal, Mizuno introduces “4355 nickel chromoly,” which is 35 percent stronger than the original Hot Metal material and allows for an eight-percent thinner clubface. Cup face construction works in tandem with a deep center of gravity for high launch with stopping power.

Mizuno developed Hot Metal Pro, Hot Metal and Hot Metal HL (High Launch) from 175,000 real golf swings recorded via Mizuno’s Swing DNA system and describes the three models as follows.

  • JPX923 Hot Metal Pro is a player’s speed cavity that’s compact, with minimal offset for confident ball-strikers seeking maximum ball speed. It’s suitable for low to mid handicap golfers.
  • JPX923 Hot Metal is a forgiving speed cavity suitable for mid to high handicap golfers. It features a full speed, high stability cavity for straight flight and distance.
  • JPX923 Hot Metal HL is a high launch speed cavity delivering a higher launching option for players with moderate swing speeds or aggressive shaft lean, it’s suitable for mid to high handicap golfers.

What Mizuno says

“The new JPX923 series was planned out with Mizuno’s custom ethos at its core” says David Llewellyn, Director of R&D for Mizuno. “We already offer more than 50 unique shafts within our custom program, by expanding to five iron models, there’s an ideal combination for every type of player.”

“We’re constantly evolving the JPX series based on more than 175,000 unique swings we capture every year on the Mizuno Shaft Optimizer,” says Bill Price, Mizuno’s Director of Fitting. “Recently we’re seeing an increase in the number of players with slightly slower swing speeds being fitted – and a trend to more shaft lean. Hence a slight increase in bounce angles through all the models and the introduction of the Hot Metal High Launch.”

Resident Club Junkie Brian Knudson’s take

Note: GolfWRX has not yet gotten an in-hand look at the JPX923 Tour or Forged irons. 

Mizuno’s Hot Metal HL irons look easy to hit and high flying with their larger sole and longer heel to toe shape. You can see some of the tech that is packed into these irons around the badge like the Harmonic Impact ribs and the Stability Frame. Like you would expect from Mizuno the finish quality and badging all look very good and catch your eye without the need for wild colors.

The Mizuno Hot Metal irons look to be the bread and butter of the lineup. The Hot Metal features a little smaller footprint than the HL, less offset, thinner top line, and narrower sole. The look from address will please most golfers and it is still packed with the technology for easy distance and effortless launch.

Hot Metal Pro irons are the smallest of the three but should still offer a great combination of looks and performance. They are still a little longer from heel to toe while offering the least offset and thinnest toppling of the group. The short irons are shaped really well and the whole set flows great from 4 iron down to the pitching wedge.

What they look like

JPX923 Hot Metal Pro

Mizuno JPX923 Hot Metal

JPX923 Hot Metal HL

Pricing and availability

JPX923 Hot Metal Pro: 4-PW RH and LH
JPX923 Hot Metal: 4-LW RH and LH
JPX923 Hot Metal HL: 5-SW RH only

Tour, Forged will hit retail in February of 2023. Hot Metal models at retail late September.

  • JPX923 Tour/Forged – $187.50 per club
  • JPX923 Hot Metal/Hot Metal Pro/Hot Metal High Launch – $137.50 per club

Loft comparisons to JPX921

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9 Comments

9 Comments

  1. Pingback: Best irons in golf of 2024: Slower swing speed (Easiest to launch) – My WordPress

  2. Pingback: Best irons in golf of 2024: Slower swing speed (Easiest to launch) – GolfWRX

  3. Pingback: Best irons in golf of 2023: Easiest to launch – GolfWRX

  4. Jub

    Sep 24, 2022 at 9:35 am

    Mizuno has a sh$t ton of irons out

  5. Ben Hoagie

    Sep 23, 2022 at 12:14 pm

    Currently playing forged 921’s 6-pw. If I were to get the 923 version, I’d get 5i, 7-9i; weaken lofts 1* on the 5, 8, & 9. Throw in 46 and 52 Ping Glide 4.0 and 58 TM hi toe.

  6. DD

    Sep 23, 2022 at 11:06 am

    The lofts on the Forged are just silly now. 3-degree gaps in long irons and 5-degree gaps in scoring irons. Makes no sense for that level of player. I wouldn’t even consider full set of the Forged.

    At least you can still go forged with the 4i or 4i+5i and then go Tours for the rest of the set. Gets you 4-degree gaps throughout.

    • Brian

      Sep 24, 2022 at 3:08 pm

      Other than the 6 to 7, it’s pretty much the same gapping going all the way back to the 850 Forged.

  7. Skip

    Sep 23, 2022 at 9:58 am

    42.5 degree PW WTF lol

    • Bob

      Sep 24, 2022 at 7:03 pm

      But your buddies are jealous how far you hit the wedge now and will run out to buy the same irons as you.

      Everything is a lie or a scam now.

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Equipment

Why pros are putting Callaway’s new Triple Diamond Max driver in play

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Editor’s note: This is an excerpt from a piece our Andrew Tursky originally wrote for PGATour.com’s Equipment Report. Head over there for the full article.

According to Nick Yontz, Callaway’s advanced R&D manager, PGA TOUR players began testing the prototype last November and found it to provide a unique combination of speed and forgiveness.

“Players would step up and we had it matched up to their gamer driver specs,” Yontz said. “They would swing, and we saw consistently good ball flights – very stable. It was the word ‘stable’ that continued to be used by players.

“They would continue to split the fairway and what that caused them to do was to start swinging faster. They had this excitement that, ‘This thing doesn’t go offline. I can keep swinging harder and harder and it maintains that straight flight.’

“We were seeing players that would have small gains in ball speed from just the driver head alone, but then the swing speed would increase the more and more swings they made. By the end of it, they really saw meaningful gains in ball speed and distance.”

From the sounds of those early testing sessions, it’s no wonder the Triple Diamond Max prototype head made its way into PGA TOUR bags, and will soon be available on retail shelves. Among 2024 RBC Canadian Open players this week, it’s been confirmed that Wesley Bryan, Kevin Yu and Carl Yuan will be using Callaway’s Triple Diamond Max head.

Head over to PGATour.com for the full article.

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Whats in the Bag

Rafa Campos WITB 2024 (May)

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Driver: Titleist TSR3 (9 degrees, D1 SureFit setting)
Shaft: Project X HZRDUS Black 60 6.5

3-wood: Callaway Paradym Ai Smoke Max (13.5 degrees)
Shaft: Mitsubishi Tensei 1K Blue 70 TX

3-wood: Titleist TSR3 (13.5 degrees, A1 SureFit setting)
Shaft: Mitsubishi Tensei 1K Blue 70 TX

Check out more in-hand photos of Rafa Campos’ clubs here.

5-wood: Titleist TSR3 (18 degrees, B1 SureFit setting)

Irons: Titleist T150 (3-9)
Shafts: KBS Prototype

Wedges: Titleist Vokey Design SM10 (46-10F, 50-08F, 54-10S)

Check out more in-hand photos of Rafa Campos’ clubs here.

Putter: Scotty Cameron GoLo 6

Putter: Odyssey Ai-One #6

Grips: Golf Pride Tour Velvet

Ball: Titleist Pro V1x

Check out more in-hand photos of Rafa Campos’ clubs here.

 

 

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Whats in the Bag

Takumi Kanaya WITB 2024 (May)

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Driver: Ping G410 Plus (9 degrees @10)
Shaft: UST Mamiya The Attas 6 X

3-wood: Ping G410 LST (14.5 degrees)
Shaft: UST Mamiya The Attas 6 X

Hybrid: Ping G410 (19 degrees)
Shaft: UST Mamiya Attas 95 S

Irons: Ping G710 (5), Ping i230 (5-PW)
Shafts: True Temper AMT Tour White X100

Wedges: Ping Glide Forged Pro (52-10S, 58-10s, 60-10S)
Shafts: True Temper AMT Tour White X100

Putter: Ping Sigma2 Arna

Grips: Palmax

More in-hand photos of Kanaya’s clubs here.

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