Casting always involves turning the metal from which the ironhead is to be made into its molten, liquid state, after which it is poured into a mold to form the ironhead design.
Forging involves literally pounding or compressing the metal, in its solid form, from which the ironhead is made into the designed shape of the ironhead, after which a number of other machining and drilling steps are necessary to complete the production of the ironhead.
If you have a cast iron and a forged iron of exactly the same shape and weight distribution design, the same loft, the same center of gravity position in the two heads, and the heads are built with the same shaft, same length, same grip and same swingweight/MOI, hitting the same ball, the shots will fly identical distances and 99-percent of all golfers will never know which was forged and which was cast.
Most of the remaining 1-percent want to believe that the forged iron would be softer in feel because the carbon steel of a typical forging is a softer metal, but scientific research has shown that the hardness difference in a metal alone is not enough to create a difference in impact feel. All of the other factors listed above are the reason for differences in the feel of shots hit with one club vs. another.
Question: Will Offset Golf Clubs Help My Slice?
Yes, but more in a wood than in an iron.
Offset is the distance that the forward side of the neck/hosel of the clubhead is set in front of the bottom of the face of the clubhead. With offset, the clubface arrives at impact a split second later than with a clubhead that has no offset or in which the face is in front of the neck/hosel of the clubhead, which is the case with woodheads.
This additional time before the face meets the ball allows the golfer to continue rotating his hands around, thus allowing the clubface a little more time to rotate around into a more square or less open position at impact.
There are two reasons that offset is more effective in woods than in irons for helping a slice. One, woods have less loft than irons, which means the slice from an open face at impact is greater. Two, the difference between a typical woodhead - in which the face is in front of the neck/hosel - compared to an offset wood is greater than the difference between a non-offset iron and an offset iron.
This greater difference between conventional and offset woods allows for more time for the golfer to rotate the face around to be less open at impact than is possible between a non-offset and an offset iron.
- Source: About.com