GMMAT, a 350 gn arrow at 300 fps will have practicallythe same trajectory at 30 yards as a 550 gn arrow at 300 fps at 30 yards. Beyond 30 yards,the 550'strajectory will actually be flatter. Butthe 550 gn arrow will be boiling up 110 ft lbs at the bow vs only 70 ft lbs for the 350 gn arrow. That's not possible if you're shooting the two arrows from the same bow.

What Iquestionis that the arrow's speed isn't constant. It begins slowing down as soon as it clears the string. It'll be flying slower at 10 yards than it was at the bow. Slower at 20 than it was at 10. Slower at 30 than it was at 20 and so on. And the speed degradation is greater for afaster arrow than it is for aslower one.

So, if the chart didn't take speed degradation into account, it isn't accurate. The question is, did the chart account for that or did it assume a constant arrow speed?