yes, but it dont matter since the size/trim die will size the neck down tight and then you have the mandrel die to set neck tension. Most of the guys that do brass prep like this on the 1050's either A.)dont subsequently load on the 1050, they will single stage load OR B.) they dont run a swage backup/expander on their loading tool head.
Or if you are really concerned you can turn down the backup/expander rod just slightly so it doesnt. Chuck it up in a drill and use some sand paper. Easy to turn down.
Ok, i see what your sying. I was thinking of getting a spare toolhead and doing the brass prep(decap, swage , size/trim) on that one and them switching to a different toolhead and doing the loading.