Chuck7...Remington.com has a great ballistics comparison site. For example: .270 cal. like you are looking forwith a 200 yd zero; a 150 gr soft point core-lokt will be 2" high at 100yds and 29" low at 400yds. A 130 gr pointed soft point core-lokt (these two bullets are virtually identical for ballistic coefficient, w/ a 20 gr. weight diff.) will be 1.5" high at 100yds and 21" low at 400yds. To reinforce what Eldequello stated...you must at leastbe able to shoot on a range with a true 200yd. distance. Most shooters could not hit a wooly mammoth at 400 yds. unless they have some trigger time (at true distance)on a particular gun and truly know the ballistics of the firearm. With out true distance shooting practice a couple of things will probably happen. 1st...and most unlikely, you will get VERY LUCKY and make a humane kill shot on an animal (you will probably not be able to duplicate the shot twice), 2nd...and the most likely and best case scenario...you will probably miss the animaland damage your ego a little (I am not trying to be condecending, just truthful) or 3rd...you will land a lousy shot and maim, cripple or gut shootan animal (it will then die a slow Sh---y, agonizing death and you will feel worse about it than the animal you maimed. Even on a 100yd range, zeroed at 200 or 250yds...you might punch great groups all day long...out at 400 yds. youprobably would not hit that wooly mammoth I mentioned. Good luck with it, .270 a great round. Shoot safe and take your kids hunting with you!!!!!