I have never understood how a supposed accuracy could be maintained between shots (requiring an accuracy of a few hundredths of an inch between successive barrel positions between successive shots at 6 - 12 miles range) when the whole barrel and mount and recoil bases are being jammed backwards inches every time.
It's just like when you're firing your rifle at the range. After you've fired and accommodated the recoil, you re-aim the weapon and begin the firing sequence again.
Displacement isn't very much either: once the recoil spades are fully seated into the ground, the weapon doesn't move much anymore.