ditto, i see it a lot with my d-pony. sometimes only one set gets pulled in from my 400 to 300, otehr times 3 sets push out to 600 while one is at 300, sometimes it's just fine. no apparent pattern.
doesn't happen with nose mounted guns, like a 38 or yak, occasionally with spits, which sometimes also pops back to the .303's from the .50's i prefer.