"...43.0 grains of IMR 4064 behind either a Hornady or SMK 168 gr HPBT. I'm using Winchester LR primers. This load is ~2400 fps, and right around the minimum values...:
Your loads are fine. Just don't go below the minimum values with "normal" powders. At those speeds I would use bullets for the .30-30 to obtain good expansion.
Cast bullet loads can go very low but they do it with small qualities of fast powders. Those loads aren't wise when using jacketed bullets.
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