Bloom applies to all sniper rifles, the DMR, and automatic weapons like the AR, Storm Rifle, and Suppressor. The other weapons have spread similar to the past Halo titles. All weapons will have some sort of bloom/spread in Halo 4. Also "flinching" is now progressive, so if you are hit once while scoped the flinch will be less, but if you are hit several times while trying to scope the flinch will increase throwing off your aim.