Inside the 155mm M109A6 Paladin Self-Propelled Howitzer. Room for a turret party....🙂 The 39-calibre 155mm M284 cannon, which is fitted with an M182 gun mount, has a range of 24km using unassisted rounds or 30km using assisted rounds. The projectile loading can be carried out using the full-stroke hydraulic system or a semi-automatic loading system. The M109A6 Paladin achieves a maximum firing rate of up to eight rounds a minute, or three rounds in 15 seconds, and a sustained firing rate of one