Chart says MPF IS 90. Is that correct?
I would guess so. I purchased a Ft. Worth 5 iron off eBay to test last year and can tell you there isn’t any forgiveness with those clubs. They are pure butter knives. I found the musclebacks from most other manufacturers to seem far more forgiving. I didn’t see the MPF rating until after I tried the club and unscientifically believe that it is probably right. I didn’t really have difficulty hitting them but I just couldn’t really get them up in the air. I had purposely swing very steep (for me) to get up in the air.
They are super nice looking clubs but they aren’t forgiving in any way and they aren’t a cavity back. They’re so nice looking I bought one to test.