Universal or Unique will work in this case. I still maintain that 2400, H110, LilGun, AA#9 or similar belong behind it though as I view it as a strict business load component.
youve never said if you cast your 300's or not. I'd like to believe this is the case. I cant say as Ive launched everything out of a 44 magnum possible, but Ive launched enough to advise you with almost anything you can cook up.

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it just needs more voltage