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Genco 17 caliber bullets from left to right: 20 grain ULD-FB, 25 grain ULD-FB, 29 grain ULD-FB, 26 grain ULD-RBT, and 25 grain round nose. "ULD" is Ultra Low Drag, which is a 14-caliber secant ogive with a .014-inch offset from tangent. The RBT base reduces muzzle blast gas laminar flow around the bullet, compared to a conventional boattail base, and blows the muzzle blast gas off in a ring instead of focusing it into a ball. This gives the bullet a clear shot through the "eye" of the turbulence, and reduces the potential group size by about 15% compared to conventional boattail bases.
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