I have a set of standard RCBS 7mm RM dies, and a set of standard Redding .300 Jarrett dies, both 3 die sets, that have both turned out ammo capable of 1/2 MOA or slightly better, from 8 lb custom hunting rifles
. Culled brass, benchrest prep of cases, match bullets, weighed charges. I usually neck size only until cases get tight, then FL resize using Redding comp. shell holders just enough to let the bolt close smoothly. My neck dies also decap.