What's the best existing die that can be reused for our purposes of opening up the neck inside diameter? Have tried a Lyman 28cal neck expander but it assumes that the neck being expanded is already close to 28cal. Have tried a Lee universal. It flares the neck but does not open the neck up making the brass be a straight wall, which is ideally what we want.
Interested in first-hand anecdotes of what die to purchase. Thanks in advance!