Personally I like the 4.625" barrel on single actions. But my preference is purely from the looks of that barrel length. The next longer barrel length on the BH is 5.5", not 6.5. I dont think you will find much difference in performance. I would suggest you try the various barrel lehgths in a gun shop and decide which "feels" best to you. Some like the balance of one over the others.
For more info on fast draw you might visit
www.gunfighter.com they have links to the World Fast Draw Association.
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Gunslinger
I was promised a Shortycicle and I
want a Shortycicle!