Mizuno MX-300 vs Mizuno JPX-800
Side-by-side factory specifications. Differing values are highlighted.
Specification comparison
| Club | MX-300 loft | JPX-800 loft | MX-300 lie | JPX-800 lie | MX-300 length | JPX-800 length |
|---|---|---|---|---|---|---|
| 3 | 20 | — | 59.5 | — | 38.75 | — |
| 4 | 23 | 22 | 60 | 60 | 38.25 | 38.25 |
| 5 | 26 | 25 | 60.5 | 60.5 | 37.75 | 37.75 |
| 6 | 29 | 28 | 61 | 61 | 37.25 | 37.25 |
| 7 | 33 | 32 | 61.5 | 61.5 | 36.75 | 36.75 |
| 8 | 37 | 36 | 62 | 62 | 36.25 | 36.25 |
| 9 | 41 | 40 | 62.5 | 62.5 | 35.75 | 35.75 |
| PW | 45 | 44 | 63 | 63 | 35.5 | 35.5 |
| GW | 50 | 49 | 63 | 63 | 35.25 | 35.25 |
| SW | — | 55 | — | 63 | — | 35.25 |
Highlighted cells differ between the two sets. Lofts and lies are factory standard.
Lofts compared
- MX-300
- JPX-800
What the differences mean
At the 7-iron, the MX-300 is 33° and the JPX-800 is 32°, a 1° gap. Each degree of loft is worth roughly 3 to 4 yards of carry at the same swing speed, so the JPX-800 should carry roughly 3 to 4 yards further with that club, on a slightly lower, shallower flight than the MX-300. Across the 8 clubs both sets share, the JPX-800 averages 1° stronger, with the largest gap at the 4-iron (23° vs 22°). The pitching wedges are 45° and 44°; the stronger one leaves a 6° jump to a 50° gap wedge, which matters when planning wedge gapping.
The sets are built differently: the MX-300 runs 3-iron to GW (9 clubs), the JPX-800 4-iron to SW (9 clubs).
The MX-300 is a players iron and the JPX-800 a game improvement iron, so they sit 2 steps apart on the forgiveness scale. The JPX-800 is the more forgiving design, with a wider sole, more offset and more perimeter weighting for roughly 10 to 25 handicaps. The MX-300 trades some of that for a more compact head, thinner topline and more control over flight and shape, which suits roughly scratch to 10 handicaps.
The MX-300 is listed as Grain Flow Forged with an undercut cavity and the JPX-800 as investment cast, split construction across the set. Forging, as in the MX-300, is generally credited with a softer feel; casting, as in the JPX-800, allows more complex cavity and weighting shapes, which is why it dominates forgiving irons.
The JPX-800 came out 1 year after the MX-300, but it is a different line rather than a direct replacement, so the two were designed for different golfers as well as different seasons.
Which should you choose?
The JPX-800 is the stronger-lofted set — up to 1° stronger than the MX-300 on matching clubs. Expect longer carry per numbered iron but a flatter descent angle; gapping at the wedge end is where that shows up.
Both charts are reproduced in full on their own pages: Mizuno MX-300 specs and Mizuno JPX-800 specs.
Frequently asked questions
Is the Mizuno MX-300 stronger lofted than the JPX-800?
No. The JPX-800 is the stronger-lofted set: its 7-iron is 32° against 33° for the Mizuno MX-300, 1° stronger and worth roughly 3 to 4 yards of extra carry.
What is the loft difference between the Mizuno MX-300 and JPX-800?
At the 7-iron the difference is 1° (33° vs 32°). The largest gap on a shared club is 1° at the 4-iron, and all 8 shared clubs differ.
Which is better for higher handicap golfers, the Mizuno MX-300 or the JPX-800?
The JPX-800. As a game improvement iron it is the more forgiving design, suited to roughly 10 to 25 handicaps. The Mizuno MX-300 is a players iron, better suited to roughly scratch to 10 handicaps.
Do the Mizuno MX-300 and JPX-800 have the same lie and length?
At the 7-iron, yes: both are 61.5° lie and 36.75 inches long.
Shop both models
Compare prices for new and used sets on eBay:
We may earn a commission from purchases made through links on this page at no extra cost to you.