Amigos -- your bow poundagas are fine, but your arrows are light. You have at very best a 50-50 chance of hitting heavy rib bone on elk if they are standing dead broadside. Turn 'em at an angle and the ribs close up completely. Worse, the most lethal shot placement, low and just behind a front leg, puts us at risk of hitting scapula, which is like an iron plate on elk. So, you can take the loser's gamble of not hitting heavy bone, or you can follow Dr. Ashby's carefully researched and unimpeachable advice to shoot a minimum of 650 grains total arrow weight for elk and other really big game. You'll also need a strong 2-blade broadhead, like the 160 Grizzly or STOS. With heavy arrows, lighter bows actually gain more arrow impact force benefit than do heavier bows. I'll be using a 55lb. boo-backed osage longbow shooting 700 grain maple arrows at barely 140 fps, with Tanto-pointed Grizzly 160s. These will make toast of elk ribs and should penetrate scapula sufficiently to get good lung punctuation (!). I have found that most folks, when they to to ask if so-and-so rig is enough for elk, don't really want advice for improvement; they want confirmation of choices already made. Like Ashby, my only motivation is to help folks make fast, humane kills on elk. I've hunted elk with trad bows for 25 years and killed 20 or so ... and in the early days, shooting 500-550 arrows with 3-blade heads out of fast factory recurves, I lost several animals with lung hits but poor penetration due to striking a rib. And among those I did kill, I had to trail most for hours or even days. Since upping my arrow weight to 650 or more and switching to long, narrow, tough two-blades, I've not had a single elk make it out of sight before dropping, and 100 percent pass-throughs no matter how much bone encountered. I am not trying to start arguments about what is possible in rare lucky perfect situations, but trying to share what is proven to work even with less than perfect hits. It's a win-win deal and out to 20 yards you'll hardly notice any trajectory difference. All best to you all, dave