The pyramid's flat faces and sharp edges bite into sand and hold against the longshore sweep, where a rounded sinker rolls straight down the beach.
Five ounces is the weight for onshore wind, building swell, or a hard tide running through a cut — conditions where a 3oz sinker will not stay in the trough for thirty seconds.
Carry the full range. Gulf beaches can go from a 2oz morning to a 5oz afternoon on the same tide, and the Atlantic side routinely needs more lead than the Gulf for the same depth.