Any feedback on using slugs through a MOD choke version of the NEF 12 GA welcomed

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The only experience I've had with slugs in the NEF 12 ga. Modified Choke, is using handloads charged with a stiff load of Blue Dot/WWAA12 wad/WW209 primer/WWAA Case/518g Lyman 12 ga Sabot Slug.

This load, from the NEF will shoot into about 3" at fifty yards.... it's the best we can get it to shoot, and I installed a Williams Shorty Ramp and Marbles Sourdough front sight along with a Marble's sweat-on rear apeture sight.  

Can't vouch for the accuracy of factory slug loads... I'm too Scotch to buy them at a buck a pop for testing!

Hope this helps!

God Bless,

Marshall