I also have a Savage 340, but I shoot cast bullets only through it.
I have used the Oregon Trails bullet, but got horrible accuracy with it when plain-based. The only accurate load with it was 7.0 of 700X at 1200 fps. ANY other load was "wild."
I cast the Lee C309-170-F and gas check it. That bullet (or the Laser-Cast with a gas check applied) shoot very accurately up to 2000 fps. My best load there is 20 - 21 of AA5744, but one that recently proved very good is 16.0 2400. (I may have finally found a use for 2400, which I used to hate.) The Lyman M die is mandatory with all cast loads.
For pure effort-free workup and loading, however, do try my classic 10.0 Unique with the Speer or Hornady half-jacket Plinker bullet. Oh my...!
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