Equipment
Spotted: Callaway GBB Epic Sub Zero “PM440” hits USGA conforming list
Callaway’s GBB Epic Sub Zero driver — the more forgiving, yet deeper-faced option in the GBB Epic driver series — has made waves on professional golf Tours, and it also garnered the most votes in GolfWRX’s Members Choice: The Best Driver of 2017. The retail models measure 460cc, but there’s another 440cc version floating around on Tour in the bag of Alex Noren.
Now, there’s yet another GBB Epic Sub Zero model in existence; a “GBB Epic Sub Zero PM440” is listed on the USGA Conforming Clubs list.
What could a left-handed Callaway driver named “PM” possibly mean? We’ll go out on a limb and guess that Callaway has made a GBB Epic Sub Zero 440 driver especially for Phil Mickelson, but we will update this story when Callaway representatives provide further insight on the “PM440.”
Update: “It’s a left-handed 440cc version of Phil’s driver,” said a Callaway representative. “It’s a one-off Tour prototype that they built of his driver for him, instead of the standard 460cc head.”
Discussion: See what GolfWRX members are saying about the GBB Epic Sub Zero drivers in our forums.
Neal Shipley was the first to admit that he enjoyed his food while in college. But since his days at Ohio State, he’s slimmed down and earned a PGA Tour Card.
That hasn’t stopped him from having fun with his wedge stampings, though it’s led to some misunderstandings.
On the 54 (degree), we have ‘Big Fudge,'” Shipley told GolfWRX. “It was supposed to be ‘Big Fridge,’ so this happened a little while ago. ‘Big Fridge’ was a nickname between my college teammates and I, with ‘fridge’ meaning stomach, a big stomach.
“We told the Ping guys to put … ‘Big Fridge’ on it, and I think maybe some bad cell service or something, and they thought I said ‘fudge,’ so they put fudge on it.”
On Shipley’s 50-degree he also continues the food theme, this time with his go-to order at the “Golden Arches,” and his stamping “DONS 7.”
“The number 7 meal, the two cheeseburger meal, that was my McDonald’s order, back when I would have McDonald’s frequently,” Shipley shared.
At GolfWRX, we are a community of like-minded individuals who all experience and express our enjoyment of the game in many ways.
It’s that sense of community that drives day-to-day interactions in the forums on topics that range from best driver to what marker you use to mark your ball. It even allows us to share another thing we all love – buying and selling equipment.
Currently, in our GolfWRX buy/sell/trade (BST) forum, @raw10628 has a L.A.B. DF3 putter and Masters putter cover up for grabs.
From the listing: “Some great items here today, time to thin out and make room for next set of gear. All prices include shipping.
LAB DF3 Purple 33.5” 68° lie with TPT – $725. LAB Masters release DF3 cover – $150.”
To check out the full listing in our BST forum, head through the link. If you are curious about the rules to participate in the BST Forum, you can learn more here: GolfWRX BST Rules
Driver: Ping G440 LST (9 degrees)
Shaft: Accra TourZ Green 5-M4
3-wood: Ping G440 Max (15 degrees)
Shaft: Accra TourZ Green 6-M4
5-wood: Ping G440 Max (19 degrees @18)
Shaft: Accra TourZ Green 6-M4
Hybrid: Ping G440 (23 degrees)
Shaft: Oban Isawa Red Hybrid Shaft 04 Flex 70 Gms
Irons: Srixon ZXi7 (5-P)
Shafts: Aerotech SteelFiber Private Reserve i80
Wedges: Cleveland RTZ (50-MID, 54-FULL, 58-MID)
Shafts: Aerotech SteelFiber Private Reserve i105
Putter: L.A.B. Golf OZ.1i
Shaft: ACCRA Putter Shaft
Grips: Golf Pride Tour Velvet
Aaron Rai’s winning WITB: 2026 PGA Championship
Russell Henley’s winning WITB: 2026 Charles Schwab Challenge
Photos from the 2026 CJ Cup Byron Nelson
CJ Cup Byron Nelson Tour Report: Koepka and Kim’s newest putters finally get hot
Charles Schwab Challenge Tour Report: MacIntyre, Åberg and Spaun all switch putters, TaylorMade launches new Spider
Details on J.J. Spaun’s surprise putter switch
GolfWRX Launch Report: 2026 Titleist GTS drivers
Photos from the 2026 Charles Schwab Challenge
PGA Championship Tour Report: Fitzpatrick, Koepka among big-name putter switches for Aronimink
Photos from the ShopRite LPGA
Maria Torres WITB 2026 (June)
Driver: Ping G440 LST (9 degrees) Shaft: Accra TourZ Green 5-M4 3-wood: Ping G440 Max (15 degrees) Shaft: Accra TourZ Green 6-M4 5-wood: Ping G440...
Eric Cole WITB 2026 (June)
Driver: PXG Lightning Tour Max (9 degrees) Shaft: Project X Titan Yellow 70 TX 3-wood: TaylorMade Qi4D (15 degrees) Shaft:...
Si Woo Kim WITB 2026 (May)
Driver: Callaway Quantum Triple Diamond (8.5 degrees) Shaft: Fujikura Ventus Black 6 X Mini driver: Callaway Paradym Ai Smoke Mini...
Wyndham Clark’s winning WITB: 2026 CJ Cup Byron Nelson
Driver: TaylorMade Qi4D (10.5 degrees) Shaft: Project X Titan Yellow 60 TX 3-wood: TaylorMade Qi4D Tour (15 degrees) Shaft: Project...
Barry
Jun 10, 2017 at 5:28 pm
I wish they would come to market with that same black/ silver or black/grey color scheme versus the green/ black scheme.
Dave R
Jun 6, 2017 at 4:22 pm
Really . A new driver!
@@!!!
Jun 3, 2017 at 10:35 pm
Personally I lprefer a smaller head like a SLDR/M1 430/440, 917 D3.
But I really wish a there was a pic from the address point of view, because that’s really a huge factor of importance I think.
@@!!!
Jun 3, 2017 at 10:16 pm
Per
Sam
Jun 2, 2017 at 5:16 pm
Maybe he’ll be able to hit 10 fairways at the US Open with this thing
Scraping the barrel
Jun 2, 2017 at 4:21 pm
Epic fail more like.
rebfan73
Jun 3, 2017 at 8:52 am
Agreed…..
Mike
Jun 7, 2017 at 8:07 am
I like the EPIC Sub-Zero much better than the Taylormade M1 which I thought was a pretty good driver. So for me and many others it is more epic than fail….