My Sako Varminter [1 in 10 twist] shot cloverleafs with 46gr of Viht N160 and Remington Std primers out of RP brass with the 87gr V.Max. bullet.
Hogdons state a max. load of 38.5gr of Varget for the 80gr Sierra bullet, using Std. Winchester primers. [ Reloaders manual of 2002. ]
15-20% reduction in powder would probably be sensible as a starter for 87gr bullets.
I have never used magnum primers in any of my .243 rifles.
I have used the Hndy 87gn HptBt - NOT V Max, in several .243's over the years with excellent results.
I used 40gns of H380 and a Fed Mag primer, the brass has been whatever was at hand at the time.
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