Ballistic Tips (BT's) were designed by Nosler for violent expansion / explosion and medium penetration on light skin type animals like deer. For most calibers shooting BT's, you're better off using heavier projectiles with bigger Sectional Density's (SD's) than you would normally use for a regularly constructed bullet. Why? 1. Heavier bullets for caliber are better in a BT because they tone down the violent expansion a bit and still have enough weight leftover for a complete pass-through. 2. The shock-value with the heavier BT will still be more than lighter standard bullets and you get more energy on target. 3. Short range shots also suit the larger round with a higher SD versus standard light weight bullets with less mass. 4. Raking quartering-away shots need a heavier round for adequate penetration. 5. A larger BT'd bullet is more forgiving if you shoot into the shoulder. Example: .270 BT's benefit from 150-gr. versus 130-gr. 30-06 BT's perform well with 180-gr. versus 150-gr.