To determine the proper neck bushing size measure the outside neck diameter of a loaded cartridge and subtract .002" to .003" to allow for a small amount of brass spring back.
RCBS Matchmaster Competition Full-Length Bushing Die Set 6.5mm Creedmoor
$218.39
3 in stock
MATCHMASTER COMPETITION FL BUSHING SET 6.5MM CREEDMOOR
3 in stock
Details
To determine the proper neck bushing size measure the outside neck diameter of a loaded cartridge and subtract .002" to .003" to allow for a small amount of brass spring back.

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