It really depends on the bait that is on hand, plugging is tough in the summer and to me better in the fall. I hate to hop on it but I would really consider using eels, its alot like plugging and the best of both worlds.
If I had to plug? I would not hesitate to use a 9 inch black slug-go, they work fantastic...
http://www.surfcasting-rhodeisland.c...g_Sluggos.aspx
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