To answer your question, IMO 4350 is not to slow for 100 - 120 gr bullets. My Powley Computer says 4350 has the optimal burn rate, if anything it's starting to look to fast with the 120gr bullets. Try Hodgdon 4350 or VV N150, they're in that same ballpark. It might be the rifle (or the bullet, the shooter, or the technique). -- Kernel
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