Mechanically, the TCmakes sense, along the lines of a smaller diameter leading the way--which would give more leeway in deviation from a path that is straight and true into the chamber--and result in fewer nose-to-breech rim snagging.
Ever tried of casting your own?
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"... Liberty is the seed and soil, the air and light, the dew and rain of progress, love and joy."-- Robert Greene Ingersoll 1894
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