I've shot them with ash and cedar...using 2 blade eskimo's. Hit ribs both times. The ash (barrel tapered) did much better than the cedar (single taper) but both did the job well.
Stay way from the shoulder, nothing you shoot is going to bust through it.
Three blades will spread the rib more than a 2 imho....a narrower woodsman vs a wider snuffer imho would be better...stay away from heads with higher angled heads if you do go with a 3. Thats my thoughts anyways, I still refuse to use them though I know plenty that do.
I do know guys who failed to penetrate so to say they are a big deer is true to a degree...depending on where you're hunting them, they can vary in size from a very big elk to almost the size of an eland. Even within the Alaska borders, this remains true...lower koy/yuk drainages they are HUGE compared to interior bulls body mass wise.
We've also opened up moose that had multiple arrow wounds (heads and portions of shafts still inside), one managed to hit the top of the chest cavity..the other two were non killing shots, one hit the spine and failed to penetrate past the portion that juts out (3 blade) the other was high above the lungs way forward, nothing but flesh and failed to exit (also a 3). We know one of the heads, he happened to be on the butchering crew.
THat said, they do die much easier than most big game when you poke a hole in their lungs....stay 1/3rd up and 1/3rd back (not tight to the shoulder) and you'll be eating moose burger/steaks for the next 2 years
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