4.5 grains is a very light load for AA #2 with that weight of jacketed bullet. In the Speer manual they suggest 5.4 gr. and have DNR as the min as they do for all powders with that weight bullet. In the Accurate manual, they do have 4.3 gr as the start load, but that doesn't mean it is a good load. Poodleshooter's suggestion of a tighter crimp is a good one. You need to raise the pressure one way or another, a tighter crimp or a little more powder or, preferably, both.
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