7MM 175gr Rebated Boat Tail AT

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Part Number:A7MM175BT
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The ULD bullet was developed during the Viet Nam era for both long range military sniper operations and later, applied to experimental bullets for Secret Service assignments.   Some of the characteristics of the ULD or Ultra Low Drag design were also incorporated in a similar but later development called the VLD or very low drag design. Both designs are equivalent for all practical purposes, except that the full ULD specification includes a rebated boattail design instead of the standard boattail (for about 15% gain in a accuracy by reducing muzzle-blast induced dispersion: the RBT step deflects most of the muzzle blast gas in a ring whereas the conventional BT tends to focus it into a ball in front of the emerging bullet, adding about 15% to the disperson or random buffeting of the projectile.)

Ultra Low Drag or ULD bullets use both a rebated boattail and a 14-caliber secant with a .014-inch offset from tangent, to achieve minimum air resistance for a given weight and caliber.

Using the aluminum tip gives you approximately 0.50 thousandths longer bullet and will shift the weight to the rear of bullet and adds to the BC. The steel tip is used for thick skin animals and any rough service apps, like removing bullet from rifle several times a day. Steel tip work well if you have to have a shorter OAL bullet because some barrel twist rates won’t stabilize a longer bullet.

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