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Okay so in this video above we get a good indication with how fast Dead Eye is. Since bullets are seen as being slower than they actually are. So I'll calc it to see how fast Arthur, John and Jack are at this state.
Calc[]
Arthur's height determined here:
Half Arthur: 269 pixels (0.92964 metres)
Police Officer (I assume he’s around the same height): 99 pixels (1.85928 metres)
Panel Height: 627 pixels
Distance from POV and Arthur:
(0.92964*627)/(6*2tan(70/2)) = 4.74495746526095 metres
Distance from POV and Police:
(1.85928*627)/(6*2tan(70/2)) = 9.48991493052189 metres
Distance from both:
9.48991493052189 - 4.74495746526095 = 4.744957465260939 metres
Time: 0.5 seconds
Apparent Speed of Bullet: 9.48991 m/s
Okay so the Police men in Saint Denis use semi-automatic pistols. Specifically one that looks like the real world Borchardt C-93 which has a muzzle velocity of 430 m/s
Real Speed of Bullet: 430 m/s
Apparent Speed of Reference: 9.48991 m/s
Apparent speed of object of interest: 7.7 m/s
Final Calculation: 348.89688100308643 m/s
Transonic