I just today (sunday) went to the range with four types of slugs to try. Winchester partition golds , winchester xp3's , federal fusions and remington accu-tips. This was thru an 870 remington and the accu-tips were the best but not by much. the partition golds were a close second.
They have integral fins that put a spin on the round-- a spin that is going to be different than the spin that might be imparted by the rifling.
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