Ultra low drag bullet information:
The ULD bullet was developed during the Viet Nam era for 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 accuracy by reducing muzzle-blast induced dispersion: the RBT step deflects most of the muzzle blast gas in a ring where the conventional BT tends to focus it into a ball in front of the emerging bullet, adding about 15% to the dispersion or random buffeting of the projectile). ULD bullets may be made with either open or aluminum tips. The most suitable weight range is toward the high side of the medium weights. There are other factors to consider with the ULD bullet including stability,spin rates, bullet lengths and weights not to mention limitations imposed by physics. The ULD is a special purpose design, not a “magic bullet” that fixes all problems. The ULD bullet is very accurate at long range with the proper equipment and loading.
The ULD bullet was developed during the Viet Nam era for 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 accuracy by reducing muzzle-
Bullet Material Specification:
Jacket material – 95/5 gilding copper C-210
Core – 100% pure virgin lead
Tip - 6061 aluminum
Bullet Technical Information:
Tip -
Caliber Weight Bullet OAL BC(G1) BC(G7) SD Barrel Twist
.338RBTAL 225 gr. 1.63 .773 .356 .286 1-11 @3500fps
.338RBTAL 250 gr. 1.73 .846 .390 .314 1-11 @3500fps
.338RBTAL 275 gr. 1.83 .918 .423 .343 1-10 @3500fps
.338RBTAL 300 gr. 1.93 .979 .455 .372 1-10 @3400fps
.338RBTAL 325 gr. 2.03 1.035 .492 .407 1-9 @3300fps
.375 RBTAL 370 gr. 1.96 .926 .451 .376 1-11 @3100fps
.408RBTAL 420 gr. 1.93 .861 .430 .361 1-13 @2600fps
.416RBTAL 450 gr. 2.05 .923 .445 .384 1-14 @3200fps
.50RBTAL 750 gr. 2.43 1.005 .502 .412 1-15 @2800fps