It is very interesting that you bring this up. I was working out my own delema a while back on this same topic. I am shooting 278 with my 06 pro-elite. I was wondering if my protec shooting 291 would be better for the MBO at the upcoming triple crown. I ran the numbers on pinwheel with the same arrows at 352.4 grains. I plugged the information into the database and saw how I would shoot a 50 yard target if I judged it for 45 yards. I found that the calculations were within 3/4's of an inch from each other. Probably closer than I can shoot that at 50, or most people in fact. However, if I had the perfect release on both shots, that 3/4 of an inch could most definately cost me some much needed points. As buckeye points out, there is a greater drop at slower speeds over the spectrum of 20-40 yards. At the same time your sight marks could be close to the same because to misjudge by 20 yards would not be likely even with the worst yardage judgers. The change would be fractional by 2-3 yard judging errors between the two speeds. Probably again a smaller increment than most would notice. With this in mind I opted to shoot the 291 fps bow over the 278 because I will be shooting up to and possibly over the 50 yard mark and I want to have the confidence that I have that 3/4 inch extra built into my bow. If a guy can control the bow and shoot accurate at faster speeds, he will most definately give himself an advantage. I can say though that my x-count goes from 11-12( over 300 fps)over forty targets to an average of 20 or so when I drop down around the 290 mark. That gives me the balance of speed an accuracy that I need.

Look closely at the numbers that were given by buckeye. 4 inches sounds like alot. Break down that 4 inches and that calculates to .2 inches per yard. Take a 3 yard misjudge in yardage and you are now talking about .6 inches difference between the speeds. I would say that a real good group at 40 yards would be about 2 inches. Move the 2inch goup down .6 inches from the other and most of the arrows would overlap. So your 40 yard pin would be about the same for the 2 speeds.

I beleive that I know where you are going with the original post. You won't notice huge differences between the speeds, but when you reach a high level of competition. That .6 inches could mean the difference between taking home the $ or footing someone else bill for a weekend of fun. A person just needs to make sure that accuracy is not sacrificed for speed.

I have found out though that spending time practicing my yardage judging has been more beneficial than trying to eek out an extra 2 or 3 fps. Confidence in your shot will score much higher than a fast bow!!!!!!!!!