0-60 in the SRT8 6.1L 425HP HEMI Charger is supposed to be 4.9 - 5.0 seconds.
0-60 in the R/T 5.7L 340HP HEMI Charger is supposed to be 5.6 seconds.
Both of these cars are using the 5-speed autostick, and the Challenger (in theory) should be a bit lighter.........

I'd expect the SRT8 6.1L 425HP HEMI Challenger to go 0-60 in a solid 4.8 seconds with the 6 speed,
and the 380HP 5.7LVCT HEMI Challenger to cover 0-60 somewhere around 5.2 - 5.3 with a 6 speed TREMEC (and a good driver).