Jerry Miculek tests out different ammo in the Arsenal Double Barrel Pistol. He loads one magazine with Hornady 220gr +P flex tip hollow point and the other magazine with regular 230 gr ball ammo. The most surprising aspect was the ball round flying through the large cavitation made by the hollow point. Because the hollow point was moving faster through the air, it hit the ballistics gelatin first. The hollow point opened up as designed and started to slow down and create a large wound channel. While the gelatin was expanding from the hollow point, the 230gr ball round caught up to with the hollow point and was traveling in the cavity made by the hollow point.
In this screen shot, you can see the two projectiles.