Ken -- Like Grizzly heads being temporarily out of supply almost everywhere, the shortage of heavy heads could be a result of folks paying attention to Dr. Ashby's research advice. Heavy heads give us two good things: a heavier arrow overall, and increased front-of-center (FoC) balance, both of which contribute significantly to penetration, esp. through bone, thus to increased lethality, thus decreased wounding loss. Problem with most current heavy heads is that they are too big, esp. too wide. Expect a whole slew of new Ashby-inspired 2-blade heads soon, where the extra weight will be due to thicker steel, not larger overall size. For years I shot 125s, and lost too much game. Then I moved to 145, then 160, and now anxiously await the coming crop of Really heavy heads, 180 and above. That's the wave of the future, at least for those of us hunting big-big game, elk, moose and bigger. If I were shopping for new heads I'd wait as long as possible before the fall seasons, and meanwhile get my setup balanced by practicing with heavy field points ... which also should be getting heavier in response to increased demand. Dave