Chambered rifles you already have shoot high BC bullets. It has nothing to do with buying a new rifle, only barrel twist. A 1-10 twist 30-06 will shoot the most sleek, aerodynamic bullets made for .30 caliber and will produce reasonably high velocities such as 200-215 grain class bullets at 2,600 fps. Plenty of power and distance. The 7mm Rem Mag with the older 1-9.5 twist will shoot 170-180 grain class hunting bullets at about 2,900 fps. Apparently many hunters believe elk are encountered only at 500 yards and greater, when in truth most are shot inside 200 yards. My longest shot was around 250 yards with a 338 Win Mag and 250 grain Nosler Partition and others were around 200 yards down to 130 yards with a 444 Marlin. Most were shot with a 308 Win using 165 Partitions. Lastly, stop concentrating on BC and use a proven bullet like a Nosler Partition, they offer the widest range of effectiveness due to operating at a wide range of working impact velocities from 2,600 fps down to 1,600 fps. Late season bull elk are dug-in and are in heavy timber, many encounters are inside 150 yards in that timber.