OK.....So another thought out of left field on this one....
why not meet in the middle???
if loading.284 calibre use the .277 ball
if loading .277 use the .264
if loading 6.5mm use the one for .25 cal
if doing .25 use the 6mm
if doing .224 use the .204
so your dies still function the way the always have,but the neck is only expanded back out a LITTLE bit...still going to be tighter than with normal expander ball...
we did it with 7.62x39mm,I just stopped using the .311 ball/rod and kept the .308 one in as usually used those projectiles anyway.
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