I guessed that it probably was. The only problem is that when building arrows of different weights, it's very difficult to keep thing equal. Althoug K.E. changes very little with different different weight arrows, the penetration potential can change drastically in some situations when increasing momentum, spine or F.O.C.. It would be my contention that very few people are limited by K.E. if they have adequate momentum, spine, F.O.C., blade design, blade sharpness, etc. Those that are truely limited by low K.E., would be better off paying close attention to almost everything else. In ohter words, take what working potential the arrow has, and put it to work in the most effective way.
I agree again though I would like to point something out. I did some calculations...If we start with a bow that throws a 300 grain arrow 300 ft/sec and therefore 60 ft/lbs ke and 0.4 slug ft/sec momentum and we then shoot a 600 grain arrow from it... if the assumptions is 125 grains virtual mass then the 600 grain arrow will be moving at 229.7 ft/sec and carry 70.3 ft/lbs ke and 0.61 slug ft/sec momentum. This is a 17.2% increase in KE and 53.1% increase in momentum. Now some will argue that these numbers show that momentum is the more important player. Right? The only problem is that it is the same 600 grain arrow! All this really says is that in this case, a 17.2% increase in KE buys you exactly the same increase in penetrating potential as a 53.1% increase in momentum. In other words, don't be confused when someone points out that momentum numbers change differetly than KE numbers. Clearly the 2 aren't directly comparable.
Staightarrow, I don't mean to imply that was what you were saying. What you said just made me think of this.