You will likely have two clubs with the same number on them, but play a club length different. For instance two 7 irons in the bag even though the loft on one is 30* and the other is 34*. Or you could adjust the lofts +/- 2* throughout the set and blend them that way. (Too many combinations to list) I tried the blended set with AP2's in the 3,4 and 5 and MB's in the 6-9. Lofts were close enough I didnt have an issue, but prefer my current T100's 4-P at 2* strong throughout the set and play vokeys 48/52/56/60. Several tour players have two different 4 irons in the bag (one part of the set and then a game improvement strong lofted iron as the other 4)

Good discussion on blending of 718 Series irons here:

www.titleist.com/.../a-better-iron-game-the-benefits-of-blended-718-irons

and here:

www.titleist.com/.../ap2-ap3-combo-set-question

I also remember a fitting guide or something that gave specific guidance on blending sets but I cannot seem to find it.

Hope that helps. Jason

Hi Tim, I'm a Titleist Club Fitter, and as Dave stated, there are multiple ways to blend sets. However, I actually just ordered the blended set your asking about. I'm not saying my setup works for everyone, but just to give you an idea, this is how I blended mine. I ordered the T100's (7 - W) at 2* strong(fyi..2* strong is as strong as you can order), the 4 - 6 at 1* weak. Only issue I had was I had to redo my wedges. I had been playing 50, 54 and 58, and now I've switched to 52(bent to 53), and 58(bent to 57). Hope this helps.
Below is how mine are setup.

T100's 7 - 32° 8 - 36° 9 - 40° PW - 44° W - 48°
T200's 4 - 22° 5 - 25° 6 - 28°