Gerry, I've used the 60-20-20 (butt- mid section- tippet) formula for many years. I generally try to make the leader butt 60% of the tip of the flyline. With a 5 wt. i.e., that's about .021 I generally will taper down in no more than 3 -4 thousandths at a time. There are tons of leader building charts on the net- I just do what works for me. This formula is great for turning over dries and fishing long leaders (up to 15') over fussy trout. For bass and big game, I use a 3 step leader- butt- fairly large drop to the mid and tippet. The steps help protect the tippet- giving it a little more shock proofing. When bottom dredging for winter steel I lighten up the butt to promote getting down quicker. Some will tell you to just use straight tippet, but I like to use indies some of the time and I feel the thicker butt makes for a better connection and turn over. I can use a nailess nail knot to quickly attach to the flyline. I grew up fly fishing, and that's what I do- lots will say I waste time and am stuck in my old ways. From my perspective, I have the right tool for the job, can build leaders right on the stream if needed, crafted to specific situations, and it saves some bucks. I use to buy kits- spools from .045 to 007 from Maxima and Rio, but they are hard to find now. I now use spools of Orvis Super Strong bought on sale or discounted.
Take notice I make no claim that this is better than bought tapered leaders or I know anything useful- just relating what works for me. Now I'm going to grab my backpack and rod tube, get on a plane and disappear for a few weeks. Hope everyone has a great time on the river.