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I just poured through a few "Vintage" loading manuals and cannot find any references to an H3031 ??? Only the old standby IMR 3031
I'm afraid once again Mr. Bartell may be right:beerchug:
All I have here now is two old cans, both of which had something else in them at one time, one that I marked H3031 from the box of powder from Higginson's, and one that I marked IMR 3031 that I got from an estate in an old milk bottle or something. So my pictorial evidence is (shall we say) shaky. It has been a few years since I got the last box of H3031 from Higginson's, and the last bit of it in the can is the end of that four or five pounds. Phone Larry..........
Like I posted before I have the same rifle - 340C. I've tried a about 5 different loads but these 2 have worked real well. Barnes X 50g or Hornady VMAX 50g with 20.5g of IMR4198.