If it is an exercise in building the perfect cartridge, I understand. However, with most handloads, there is more variation in pressure caused by dropping different amounts of powder and shot, and seating the shot cup/wad with varying pressures than is gained by trimming to a precise length.
Then ballistics are never all that precise for a shotgun anyway and the pattern size and density varies in small ways with every shot. Very unlike sniper rifle ballistics and ammunition control.
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