I’d be indifferent to either action as long as it had a 3.6” mag box on it for the 300 myself.
If I was building a 300 Winchester I’d love a 200 grain Accubond to touch the lands at around 3.575” knowing I’d be backing up a bit for accuracy and still leaving a lot of room in the case for powder.
Either way, I’d want my preferred bullet I wanted to use to be within reach of magazine loaded rounds myself.
Which bullet do you have in mind for the 300?
