You had to go there. I shoot Remington Coreloked ammo in my ancient Mauser, which was built over 100 years ago, because it is designed to be fired from ancient rifles, like mine. I have a friend, who shoots a CZ that is about 15 years old, and who reloads. He has designed some hotrod rounds for 7x57, that would blow my rifle up, in my face, no doubt. He has also designed some reloads for me, with a 78 grain projectile, in a polymer sabot casing, that are incredible, allow me to shoot out to 600 yards with a dead on target acquisition, with iron sights. My hold over is line up the top of a silhouette target, drop is about 4-5 inches, smack the target dead in the face.