Need Some Help on 1 Shotting

Soo, I can pop heads easily with the M4 (1 shotting people BW Long A), but when I use a weapon that isn't automatic (like the Deagle and Winchester), I can't hit anyone and end up overcorrecting and shooting right to the left/right of their heads?

What can I do to improve this (besides practice, practice, practice -.-)?

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