i am tring to find out what would be the ideal caliber for deer out to 1000 yds. more than 90% of the shots will be 600 and less, but i still want to be able to effectivly take a deer at 1000 with a good shot. what would be the best caliber on a winchester magnum action? 7mm rem mag? 7mm um? 300um? i really like the looks of the 300um, but does it have that much of an advantage over the plain ole 7 rem mag at these ranges? thanks for all replies