Foot pounds of energy kills nothing. The combination of bullet speed, bc, and bullet construction/type are what gets the result, good or bad. I am running the 95 Berger ( and 95 TMK) at 3000fps and it is dynamite. Do the calculation for 123SST at 2450 vs 95 VLD at 3000 at 300yds. Not really apples with apples. I have a longer barrel that gets 3150 with the same pills, compare that....... If you run the .243 slow and with poor bc bullets, then saying they are similar is valid.
At point blank on a pig, the slow SST is going to be better, but once you are out a bit, no.
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