[Rangefinder]

I have both a 6mm Rem (.243 caliber) and a 7mm Rem Mag. I've taken quite a few elk with the 6mm over the years (all of which dropped within 100 yds of where I hit them, most fell right where they stood), so I know the weapon is fully capable. It's the human factor that can be questionable. However, a bad shot with ANY caliber is going to give you a long day of tracking. 7mm with 140 gr. Nosler Partitions is a pretty soft load and wouldn't be a bad step up if you wanted to go that route. It can run roughly the same velocities as the .243 with a 100 gr. Partition, or even a little higher depending how each are loaded. That extra 40 grains can make a pretty big difference. Just bear in mind it's going to still require very good shot placement for a one shot kill.