Xbolt, I ran some numbers for you on my Load From a Disk ballistic program. If you use a 200 grain bullet with a BC of .56 (Sierra Pro Hunter) and load it to around 2600fps for an MV, you'll theoretically get the following: Muzzle Energy of 2665; terminal velocity @ 500 yards of 1747 fps; terminal energy of 1356. With this load, you'll be coping with a 91 inch bullet drop, or 7 1/2 feet. In my very limited experience (2), moose take a lot of killing. So, while the terminal energy is generally considered adequate (above 1,000 ftlbs) to take a large animal, bullet placement is really, really critical for a humane, one shot kill. At that range and having to figure a 7 1/2 foot holdover, I'd suggest to you that the 30-06 would be a marginal cartridge unless you are able to get a whole lot of practice in between now and the time you go hunting, and prove to yourself that you can put 5 shots on a paper plate sized target at 500 yards.
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