Are you talking about fullbore or smallbore ?
If fullbore, phone Mike Collings (Collings Guns), or talk to someone at your local NRANZ club (see https://www.nranz.com/associations-a.../member-clubs/)
A lot of the older 308 target barrels are 1 in 14 twist, so not suitable for stabilizing anything heavier than 155 gr
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