The test of any slug load is how it groups. In my experience, the more moderate speed loads provided the closest groups, by far. I never used maximum speed slug loads after doing some testing at the bench, which eliminated all manufactured slug loads. I've killed an awful lot of deer with the moderate loads and the sabot loads through a rifled barrel was accurate to a full 100 yards. I've never tested the 3 1/2 inch loads but I imagine they would be lacking at the bench.
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