Personally, I would check bullet fit before I go chasing a specific hardness to reduce fouling. This means slugging your bore and cylinder throats, then sizing 0.001 to 0.002 over. Only then should you start chasing specific hardness.
Too many people try to chase hardness as a solution when bullet fit is often the culprit.
I dont see if you are loading for revolver or rifle but War Eagle's comments about bullet fit are spot on.
I have HT when I have been aiming for velocity in excess of 2300fps in my 404 Jeffery but because I had loads from 1400 right through I knew bullet fit was good. In the end a different alloy has given me a load at 2365fps and excellent accuracy. In my 7x57 I run a soft nosed/hard shanked bullet at 2415fps and it is good for meat hunting out to 250yds.
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Von Gruff.
