Brass issue

[nsaqam]

Also, a collet is the most precise centering device used in machining.

If you're turning parts to a tolerance of .0001 or less you use a collet.

Bushing style dies rely, by their very nature, on the neck walls being precisely the same thickness meaning your brass needs to be extensively prepped or you'll get varying neck tension.

I have neither the time nor inclination to neck turn all my cases.

Tried it for several years and found no benefit for me and a whole lot of fussy tedium.