my dad made a moose call out of a big soup can and a long piece of flat shoes lace. (not the rope kind) anywho when you wet the string and pull it gradually with consistany all the way to the end, it sounds like a cow giving the im so lonely sound. The can creats a deep voiced whaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa. Anyways just look for a huge black spot when your looking for them and dont worry cuz sometimes they wont so any indication of being hit, theyll just look at you and start getting wobbly legs.(alot of the time they dont hump uplike a deer.) im only 14 and dont know one thing about bulllets but i got a cow this year with my single shot 30-30 so ur 7 mag should be good, but i dont know a thing about loads so yaaaa.....