ORIGINAL: huntingson
The range estimation or need for it is the difference. The important thing is how long the arrow has to "fall". Obviously, the longer it takes to get to the target the more arch there is to the trajectory. The faster, the flatter, the more room for error on range estimation. Or so I think.
Even range estimation is NOT that important,BELIEVE IT OR NOT.Unless you get into EXTREME speed differences,there is little difference in 30 fps at 40 yards.
We have gotten into this before and many started actually testing the differences and many started to see the light.You have to remember that you have to figure only the miss difference in range estimation and not total drop,especially when using pins.
Try it,sight in at 40 yards with a lighter arrow at 40 yards(30 might be more realistic for most)and then walk back 5 yards and shoot it for 40 yards.Measure the miss distance and then repeat with a heavy arrow,you will be amazed at how little difference there really is in the miss difference between the 2 arrows.
Personally,I am only looking at about 1" difference with 100 grain difference according to my program,and I use it to set my pins so it is pretty accurate.
I am not saying to change poundage because that will change the difference because the energy level changes.