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I think Boyd probably has the most experience by shooting both the wsm and ultramags. He's won numerous flights at 1000yd benchrest comps with the 300WSM shooting a 210g JLK I think. Personally, it would depend upon what type of gun I was setting up to shoot. If it's a carry gun for shooting 800yds and under, I don't think I would bother with the belt on the 300 win or bother burning the powder out of an ultra. The 300wsm will get you there easily. If I was building a "fixed position" rifle then I would probably go with the 300Ultramag.
The 300WSM is a great case design. It follows the 308win in the fact that you really can't improve it.
On the other hand, my gunsmith's wife killed an elk at 1100 yds with a 300win mag and like he says: what more do you want a gun to do?
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