a) Try putting a new projectile into a fired case and see how well it stays in place....f all chance.
b) that sounds really dangerous to me unless the brass neck has been carefully and precisely sized and most ammo ie non-target type will not have been worked on that carefully.
c) if nothing else for accuracy you want consistent neck tension every time IMHO.
This is not something that I would consider acceptable for anything that isnt a careful single shot feed ie out hunting as the projectile can get knocked back.
Now I would certainly say my impression is for target work you want as low as tension as you can get ie about 1thou, hence when/if I full resize my brass to bump the shoulder back etc I then neck re-size which is slacker than a full die on my 303 anyway.
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