I have a 6.5X55 that really likes H4350 and almost every 120 - 140gr. fed to it. Lapua brass, Winchester primers, H4350, almost any/every 120-140. I have not shot anything lighter nor heavier. 139s and 140s shoot great.
HOWEVER ! I'm shooting an 8 twist. So that may not be much help to you.
Jim
BE STRONG IN THE LORD, AND IN HIS MIGHTY POWER. ~ Ephesians 6:10
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