For range use, IPSC and casual carry... I have a 2 inch rd butt 10-7, a 4 inch pencil barrel 10-5 and a 2 inch 15 (that I haven't shot because the timing is off and it doesn't carry up to full lockup). I like both the 2 and 4 inch very much and find the 2 inch clears leather faster, points really quick and is reasonably accurate. The 4 inch is also a quick pointer with the tapered barrel and I like the increased sight radius and very visible tall front sight. I am now thinking about a 5 or 6 incher model 10 and am looking for some advice as I have never shot either in a tapered barrel K frame. Am I kidding myself or will the extra inch or two make much difference on a pencil barrel fixed sight revolver for practical accuracy?