RBT, Open Tip set
	Quantity in Basket: None Catalog No.: RBTO-4-S Price: $1,135.00 Shipping Weight: 3.00 pounds
	Enter actual diameter in inches: Select Ogive (nose) Shape: Truncated Cone (TC) 1/2-E Blunt RN 3/4-E Pistol RN 1-E Rifle RN 1-E standard flat tip (50% of caliber) Luger 9mm shape 2-S Short Spitzer 4-S Short Spitzer 6-S Standard Rifle 8-S Spitzer 10-S Spitzer 12-S spitzer Ultra Low Drag Secant Custom Shape (+ $240) Enter custom ogive specs: Optional Note:   Add Lead Tip Hollow Point CS Ext. Punch (LT-HP) (+$70)   Add Open Tip Hollow Point CS Ext, Punch (OT-HP) (+$70)   Add Lead tip CS Ext. Punch (LT) (+$70)   Remove std. Open Tip CS Ext. Punch (OT) (-$70)
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The RBTO-4-S rebated boattail, open tip 4-die set makes RBT bullets, which have higher BC than flat base with up to 15% improvement in muzzle-blast induced bullet dispersion compared to conventional boattails. The RBT shoulder or step is typically about .015 inches. It acts as a gas seal in the bore, and provides for deflection of the muzzle blast gasses, so that the bullet shoots through the clear air in the center of a ring of gas. With a conventional BT base, the muzzle gasses tend to flow around the base and follow the bullet outline, breaking up in turbulence ahead of the bullet. The difference shows up as a tighter group compared to the BT, with higher BC than a flat base. Corbin's DC-1001 bullet design calculator can be used to find the difference in BC with flat, BT, or RBT bases when all other factors are equal.