Fisher, have you looked at the Lyman Reloading Manual? It lists velocities for 10" and 14" barrels, for both lengths in many cases, and both 10" and 16" for 45-70. For instance, .222, .223, 7mm TCU, 30-30, all have both listed. There would not be different loads, since I believe the maximum pressure would be the same regardless of barrel length.
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