hmmm apart from accuracy why?
I can understand its compact for shooting from 4x4 but excalibure is more than accurate enough as standard has more shots per fill (75 in sweet spot sub 12) and multishot (7) mine is nearly pellet on pellet at 40 yd. had it for 6 years of abuse in all weathers and no rust It has only had fill probe seal changed since I owned it too.
not biast honest
Its your decision but must admit ultra is good too, but excalibure is a also a thing of bueaty and accuracy is more than enough, but if you swap you will also inherit a condition that will cause you to