ORIGINAL: Colorado Luckydog
I love my Remington 300 ulta mag.It may have the capability of that range butI do not. Your asking what caliber to 600 yards, but 600 yards shots are not easy with any gun.I shoot more than the average Joe and there's no way I would take a shot at 600 yards at any animal. A good gun, a great scope, a good teacher, and hours of practice are what is needed before you should be thinking of 600 yard shots. A Remington 300ultra mag in a 150 grain SwiftScirocco will drop a little over 25 inches at 500 yards. It takes a lot of practice and good equipment to make that shot. JMHO
I think you said it best CLD. All of us dream of the 600 yd shots, but for most mortals this is pure fantasy. In most situations it's hard to even spot and identify a suitable animal to shoot at this range. And I remember the immortal P.O. Ackley writing about 500 yard rifles. Ackley rightly said, "Most people can't hit a flock of circus tents at this range without specifically sighting in their rifles for it."
Almost everything that has been killed since the crust of the earth cooled has been done in 100 yds or less. I worry about 300-400 at the max. Anything farther, I need to reposition me or wait for them to come closer.