bullets have changed since then but i don't believe the .243 was ever able to reliably take down rams. A 107 at 3000fps wasn't enough for even 80% reliability and at 3300fps was way too much. some folks blew bullets up around 150 to 200 meters from over stabilization, other blew bullets up on the targets. back wind, mud on the stands, loose stands, bowed targets... all played havoc. even under perfect conditions if the rams weren't soft set you could still lose a couple three rams. for reliable take down and manageable recoil, i don't think you can beat the .260 Remington. and you are still going to lose a few...
dave imas