I agree Mobow. 5 years ago I tested this theory with my recurve against a compound with an over draw. My recurve shoots about 210 fps, his compound was 260 fps. My arrows weighed in at about 600 grains, his on the compound were 400 I think it was. Whatever they were they were much lighter arrows. Both arrows were tipped with a bear razor COC broadhead. For the test we used a 5 gallon pail full of sand. My recurve smoked this compound for penetration at 10 yards. I had 2 holes, the compound only had 1. Thats momentum!!