The only reason I can see as to why the 68gr bullets keyhole is maybe the twist rate in your barrel is too slow. Do you know what twist it is rifled at? Put a cleaning rod in the bore and make a dot with a marker on it near the handle. Start pushing it through and watch the mark. When it has rotated 360 degrees note how many inches the rod was pushed. You probably will be needing a 1 in 9 twist or better to stabilize those bullets. I'm sure someone with more experience with it will chime in.
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