Cast bullets and load experiments with the .30-30 NEF sb2 single shot

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These are the first of the tests using 158gr .311 Spire Point cast GC bullets provided me by LeftoverDJ. Once I stumble on to something worth pursuing, I'll extend the range to 100 yards.
I'm testing only IMR 4198 until the load range has been tried from the bottom to the top, then other powders will be tested. The next in line will be H-335, or BW 36 which is a H-322 clone. I also have two other of DJ's bullets to run through the test. This could take a while.
I again checked the twist rate just to make sure. It is a confirmed 1-12".
I haven't slugged the barrel but I'm shooting only leftoverdj's hard cast .311 gas check bullets in my tests. My NEF sb2 was purchased new in 1992 at Clark Brothers in Warrenton VA.
I am open to advice and good suggestions in this test with my NEF sb2.